Monday, 18 June 2007

Digital Cameras Using Tips (3)



16. What kind of camera do I need to print out a 4 x 6 inch image or a 8 x 10's? 
Here's a simple way of answering this question: Print Szie Minimun Resolution Needed
4 x 6 inch,
5 x 7 inch 2 Megapixel
8 x 10 inch 3 Megapixel
Lager than 8 x 10 inch 4+ Megaoixel

A four Megapixel camera will not make better 4 x 6 inch prints than a 2 Megapixel camera. However, it does capture a lot more detail, allowing you to crop your image while still maintaining enough resolution for a high quality prin


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17. What sort of problems will I have with rechargeable batteries?

Rechargeable batteries lose their charge sitting in the camera. Ni-MH batteries lose between 1% - 4% of their charge a day. Since many cameras start reporting a low battery at 80% of full charge, the batteries could be reported low in as little as ten days. This number will vary greatly depending upon the age of the battery, temperature, and camera.
Memory effect was a problem with older Ni-Cd batteries. This problem has been reduced with newer batteries and chargers, though how you use your batteries may also impact performance. Ni-MH batteries do not have this problem, nor do the Li-ion batteries


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18. What's the difference between optical zoom and digital zoom?

It's important to understand this difference, as you could end up mighty disappointed with the results if you get one rather than the other.?/p>
Optical zoom is similar to what you'll find in a regular 35mm camera: When you push the button to zoom in or out, physical lens elements move inside the camera, to achieve the desired effect.
Digital zoom, on the other hand, has no moving parts. Using the "electronic brain" within the camera instead, the camera takes a look at what it's "looking at", and digitally zooms in, usually two to four times closer.
The problem with digital zoom is that you lose quality when you do this -- your images will tend to be more "pixelated" than the same image taken with an optical zoom camera. This is due to the "interpolation" the camera uses, which is a nice way of saying that it makes a guess about how the picture should look while zoomed in. Having optical AND digital zoom on a camera isn't bad, but we suggest try to avoid cameras with only digital zoom


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19. Why is there a delay after I push the shutter release button before I can take another picture? 
There are many reasons for this delay. The camera must:
Set the focus, exposure time, white balance, etc.
Charge up the CCD
- apparently it can't hold the charge for long, so it does it right before you shoot
Copy the image out of the CCD into RAM.
Compress the image after it's been taken
Write the image to the flash memory.


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20. Why my camera reports a low battery after only ten minutes of use?

Digital cameras are power high-drain devices. They will take the life out of your battery, particularly if you take a lot of pictures in rapid succession. It is not uncommon for some digital cameras to report a low battery after only ten minutes of use, if you are using the flash and the LCD display at the same time.
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21. Will a high resolution camera make better prints than a lower resolution camera? 
To be more specific: will you get better 4 x 6 inch prints from a 3 or 4 Megapixel camera versus a 2 Megapixel camera? Possibly, but the average person won't notice. The real advantage of a higher resolution camera is that with the larger image size, there's more room to crop images. In terms of quality though, it's not a huge deal. At print sizes like 8 x 10 inch, you will notice a difference.
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22. Will an airport X-Ray scanner erase my pictures on a digital camera card?
No, the chance of this happening is very remote


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Digital Cameras Using Tips (2)



10. What does megapixel mean? 
A pixel is a little square that makes up the image on your computer screen. For example, your computer's 17" monitor has a resolution of 1280 pixels wide by 1024 pixels tall. A digital camera's CCD can only capture so many of these pixels, which are then stored in memory, and later transferred to your computer.

If a camera can capture at a resolution of 1280 x 1024 (just like the above monitor), which is a little over 1,300,000 pixels (finding out the total pixels by multiply 1280 x 1024). The word "mega" is taken from the Greek word meaning "great", and usually means "one million". Hence, a camera with 1,000,000 pixels is a 1 Megapixel camer


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11. What is ISO speed? 
This setting has been adopted from film cameras. It refers to the film's sensitivity to light. Higher ISO speeds are needed to take pictures in worse lighting conditions, however they also cause an increased amount of noise. 100 ISO is the default. At 400 ISO the noise is easily detectable on most cameras.
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12. What is JPEG and TIFF? 
Two most popular picture storage formats used by digital cameras are JPEG and TIFF. The JPEG format uses lossy compression (some data judged by the algorithm to be less important to the human viewer is discarded) to achieve small file sizes. The TIFF format uses lossless compression so no information is lost, however the pictures are typically much larger. High-quality JPEG setting is preferable for most uses.
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13. What is red-eye reduction? 
Red-eye effect occurs when the pupils of people's eyes appear to be red in a picture. This effect can be prevented by using the camera's feature of shining the light before a picture is taken, asking the subjects not to look directly at the camera, or using the photo-editing software's red-eye removal feature.
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14. What is the deal with the different "quality" settings on my camera?

Most, if not all, cameras have several image quality settings to choose from. They are first broken down by resolution (e.g. 2048 x 1536, 1600 x 1200, 1024 x 768, etc) and then by quality (e.g. SHQ, HQ, SQ). What's the right one to use?
The deal is this: quality is inversely proportional to the amount of JPEG compression the camera uses. Thus, a higher quality image will have less compression, and vice versa.
As you lower the quality and increased the compression, there will be more "artifacts" in your image. The artifacts are a result of the higher JPEG compression. You will notice that edges will seem blurry, or little squares will appear. See the example above for a good illustration of this.

We recommend using the middle setting for everyday shooting. If you're making big prints, consider using the highest quality JPEG level. Skip over TIFF mode, as the quality really isn't any better than high quality JPEG, but they take up much more space on your memory car


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15. What is the difference in performance between rechargeable and non-rechargeable batteries? 
Rechargeable batteries perform a little differently than non-rechargeable batteries. The voltage coming from an Alkaline (non-rechargeable) battery decreases steadily as the battery is discharged. Ni-MH and Li-ion batteries have a lower starting voltage than Alkaline (typically 1.2-1.3V vs. 1.5V for Alkaline), but rechargeables maintain this level until they are almost discharged. One potential problem: the battery life indicator of the camera may be calibrated for alkaline batteries, which could make it somewhat inaccurate. What sort of problems will I have with rechargeable batteries?

Rechargeable batteries lose their charge sitting in the camera. Ni-MH batteries lose between 1% - 4% of their charge a day. Since many cameras start reporting a low battery at 80% of full charge, the batteries could be reported low in as little as ten days. This number will vary greatly depending upon the age of the battery, temperature, and camera.
Memory effect was a problem with older Ni-Cd batteries. This problem has been reduced with newer batteries and chargers, though how you use your batteries may also impact performance. Ni-MH batteries do not have this problem, nor do the Li-ion batteries



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Digital Cameras Using Tips (1)


General frequently asked questions about digital camera.

1. Are manual controls important? 
Automatic settings can work for amateur photographers in a majority of cases. However, once a few pictures come out underexposed or blurred with auto settings, the manual controls become necessary.




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2. Does CCD size matter? 
In general, the larger CCD means a bigger light-collecting area and therefore better performance in low-light conditions with less noise. However, this rule is very inexact and it doesn't hold in many cases. The trend is to lower the CD size because it also lowers the costs.

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3. Does it matter what kind of battery I use? 
Yes. It is better to have a rechargeable battery with your camera, instead of the regular AA batteries. In fact, many manufacturers are starting to include rechargeable batteries with their cameras because they know that it makes little sense to use regular batteries with their cameras.

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4. How do digital cameras work? 
In contrast to a conventional film camera, in a digital camera the light is focused onto an image sensor called a CCD (charge coupled device). The CCD is a collection of light-sensitive photosites that produce an electric charge when struck by light. These charges are converted into numbers that are stored in the memory (usually on a memory chip). From there, the whole image can be displayed, sent to a computer, or even printed directly on a printer.

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5. Help Center How many types of batteries are there for the Digital Camera?

Two kinds of batteries are widely available: Ni-Cd (Nickel Cadmium) and Ni-MH (Nickel-Metal Hydride). There is a third type of rechargeable battery, Lithium Ion, that is becoming increasingly popular.The advantage of a Lithium Ion battery is that it offers better performance than the other two types. The disadvantage is that they do not come in the standard AA battery size, so you can't use them with most cameras

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6. I'm having trouble downloading photos to my computer with the software that came with my camera. What can I do? 
Buy a card reader will be a good idea. When you insert the memory card, it will mount to your desktop just like another disc, and you can copy the photos directly to your hard disk. You can then use your favorite photo editing software to retouch your photos.

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7. What about MPEG movie modes in digital cameras? 
Many digital cameras offer the ability to shoot short movies that are saved in the MPEG formats. Unfortunately, the quality of these movies doesn't come close to the movies shot with a camcorder. They are often severely limited in terms of length. Some cameras also don't record sound.

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8. What are SLR digital cameras? 
In an SLR (Single Lens Reflex) camera, the user is seeing exactly what the camera is seeing through a series of prisms and mirrors. This becomes important for more advanced photographers. In SLR cameras, it is also possible to interchange lenses and keep the lenses from other cameras. Many digital SLR cameras also offer higher resolution since they are aimed at the pros. The disadvantages of SLR digital cameras are the significantly higher costs, bigger size and weight, and a small delay before the photo is taken because the mirror has to move out of the way before a shot.

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9. What digital camera accessories do I need? 
One major upgrade needed by almost all digital cameras is a higher capacity memory card. You should buy as large a memory card as your camera can accept, as the memory cards that are included with the cameras are usually not nearly big enough to hold a good number of high quality pictures. Other accessories worth considering are a battery charger, rechargeable batteries, tripod, and a camera case.



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Cell Phone Battery Help and Tips



1. Battery Conservation Tips

Is your cell phone battery losing power constantly? Have you ever had to stop using your cell phone in the middle of a call because the battery died? Here are a few tips you can use to conserve your cell phone battery's power:

* Turn off the backlight. While this may make it harder to use your cell phone at nighttime or in pitch-black situations, most of the time you can easily use your cell phone without it being brightly lit. If you must, change your cell phone's backlight settings so the light goes off after 5 or 10 seconds of inactivity. This way your phone should still be usable at nighttime.

* If you know you're traveling to an area without coverage or with only roaming coverage, consider turning off your cell phone. It can use up a lot of power trying to find a suitable network.

* The less you talk, the less battery power your cell phone will use. Try to limit your conversations until you can get to your home phone.

* Limit your usage of non-voice features such as web browsing and playing cell-phone games. If you have a picture cell phone, realize that taking pictures can eat up battery power, especially if you have flash turned on.

2. Recycle Your Old Cell Phone

Purchasing a new cell phone? Don't just toss your old cell phone away! For one thing, it may be illegal to dump the battery inside your cell phone depending on your jurisdiction. And secondly, dumping cell phones creates more trash in our landfills that has a hard time degrading.

The following websites claim to help you recycle your old cell phone. Some let you donate cell phones to a charity and you may even be able to get a tax credit (refer to a legal professional for more details). Note the following websites, including mentioned charities, are listed for informational purposes only and may change.

* Charitable Recycling Program

* CollectiveGood

* WirelessRecycling.com


3. Set up Voicemail

Most cell phones come built-in with a voicemail feature. Think of it as an answering machine, but you don't have to hook it up or rewind tapes. If you can't take a phone call, instead of the caller just getting endless ringing, they will be able to leave you a message you can pick up at a later time. There are many ways voicemail can be useful:

1) If you travel out of your cell phone network, friends and family can still call and leave you messages

2) If you get a call from an unknown number, you might consider screening the call. If someone leaves you a message, more than likely they are really trying to get a hold of you and are not just a wrong number or telemarketer.

3) If your cell phone battery loses its power, you can still get messages from people. Some cell phone companies even let you access your voicemail from a landline phone.

Talk to your cell phone provider about setting up and accessing voicemail.

4. Keep Batteries Charged So You Don't Miss Calls

Just as a digital camera can easily run down a battery, so can a camera phone. Taking photos and looking at your pictures with friends and family can use up quite a bit of your power.

If you plan on taking lots of pictures, make sure you fully charge your cell phone first. You wouldn't want to take a lot of pictures on your camera phone then find out that the phone doesn't have enough power to accept or make calls, would you?




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CD & DVD Using Tips


General frequently asked questions about Storage & Media.

1. Can CD-R writers create DVDs?   
No. DVD uses a smaller wavelength of laser to make smaller pits in tracks that are closer together. The DVD laser must also focus more tightly and at a different leve


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2. Can I just copy files onto a CD-R like I would to a floppy? 
Not really. The process is usually a bit more involved than that, and requires special software that (usually) comes bundled with the drive. Some software does allow you to drag-and-drop, but it generally isn't used.
You don't need to write everything all at once, but when you're doing the writing you can't interrupt the drive, and you can't reclaim the space you've used


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3. Can I use CD-R to copy my CDs? 
Yes, both audio and data CDs can be duplicated.
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4. DVD Sizes. 
The DVD sizes can be a bit confusing. There are basicly 4 different DVD Sizes,
DVD-5, holds around 4 700 000 000 bytes (4.7 GB) and that is 4.37 computer GB* where 1 kbyte is 1024 bytes* . DVD+R/DVD+RW and DVD-R/DVD-RW supports this format. Also called Single Sided Single Layered. This is the most common DVD Media, often called 4.7 GB Media.

DVD-10, holds around 9 400 000 000 bytes (9.4 GB) and that is 8.75 computer GB*. DVD+R/DVD+RW and DVD-R/DVD-RW supports this format. Also called Double Sided Single Layered.

DVD-9, holds around 8 540 000 000 bytes (8.54 GB) and that is 7.95 computer GB*. DVD+R supports this format. Also called Single Sided Dual Layered. This media is called DVD+R9, DVD+R DL (dual layer) or 8.5 GB Media.

DVD-18, holds around 17 080 000 000 bytes (17.08 GB) and that is 15.9 computer GB*. DVD+R supports this format. Also called Double Sided Dual Layered.

* In the computer world is 1 KB data = 1024 bytes so,
4 700 000 000 bytes / 1024
= 4 589 843KB / 1024
= 4482MB / 1024
= 4.37GB


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5. How come my 4.7 GB DVD isn't really 4.7 GB? 
Like hard drives, 1 GB on a DVD recordable disc equals 1 000 000 000 (109) bytes. In contrast, a computer considers 1 GB to be 1 073 741 824 (230) bytes. Thus, a 4.7 GB disc is seen by a computer as having approximately 4.37 GB.
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6. How long does it take to burn a CD-R? 
It depends on how much data you're going to burn, and how fast your drive is. Burning 650MB of data takes about 74 minutes at 1x, 37 minutes at 2x, and 19 minutes at 4x, but you have to add a minute or two for "finalizing" (sometimes known as "fixating") the disc. So, burning 700MB of data takes about 3 to 4 minutes at 52x with "finalizing" the disc.
If you have half the data, it will finish in (about) half the time.

Remember that single speed is 150KB/sec, double speed is 300KB/sec, and so on



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Card Reader/Writer



General frequently asked questions about Card Reader/Writer.

1. How many card slots are in the 9-in-1 Card Reader/Writer? [ Created: 12-1-2005 ]
9-in-1 Card Reader/Writer has 4 slots. They are:

SD /MMC Slot
- to insert SD (Secure Digital) card or MMC (Multimedia Card)
MS Slot
- to insert MS/ MS Duo/ MS Pro/ MS ROM
CF /MD Slot
- to insert CompactFlash Type I/II Card or IBM MicroDrive
SM Slot
- to insert SmartMedia Card or xD-Picture Card


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2. The memory card compliant for the 9-in-1 Card Reader/Writer.

Fully compliant with USB v2.0 specification and USB Device Class Definition for Mass Storage, Bulk-Transport v1.0.
Fully compliant with Compact Flash (CF) v1.4 specification.
Fully compliant with Secure Digital (SD) v1.0 specification.
Fully compliant with Memory Stick (MS) v1.3 specification.
Fully compliant with Memory Stick PRO v1.0 specification.
Fully compliant with Memory Stick ROM format v1.0 specification.
Fully compliant with Smart Media Card (SMC) standard 2000 specification
Support IBM Microdrive device.
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3. What does it mean if the LED is lighting? 

When any flash memory card is inserted in Card Reader, the LED will light;

When the LED is blinking, it indicates there is a read/write data process from/to flash memory card


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4. What kinds of cards does the 9-in-1 Card Reader/Writer support?

Supporting Flash Memory Types:
CompactFlash Type I/II Card (CF)
IBM MicroDrive (MD)
SmartMedia Card 3.3V (SMC)
xD-Picture** Card (xD)
Secure Digita Card
- Mini Secure Digital** (Mini SD) with adaptor
Multimedia Card (MMC)
Memory Stick** (MS)
- MagicGate** Memory Stick (MS)
- Memory Stick Pro** (MS Pro)
Memory Stick Duo** (MS Duo)
- MagicGate** Memory Stick Duo (MS Duo)
- Memory Stick Pro Duo** (MS Pro Duo)
Memory Stick Rom**
** The brand names/trademarks/trade names specified are registered properties of their respective owners




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Camcorders Using Tips


General frequently asked questions about camcorders.

1. Do SECAM camcorders exist?   
Not anymore. SECAM camcorders were produced several years ago but are no longer in production. This is not a problem, though. All SECAM countries are compatible with PAL. SECAM-only TVs and VCRs are no longer in production, either.


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2. What are the inputs/outputs on camcorders for?   
VHS camcorders are the only camcorders where you can take the tape out of your camcorder and stick it directly into your VCR to watch.

All the other formats require that the video be outputted from the camcorder. For example, if you had a DV camcorder and wanted to watch it on your television, you'd use the RCA outputs. You could also connect these outputs directly to your VCR and a make VHS copy.

Some digital camcorders include what is called digital out or firewire out. This is a method by which a camcorder outputs its video signal digitally. When hooked up to a computer, you can download an entire day's recording onto your computer. The DV IN that some camcorders have also allow you to output from your computer digitally and record digitally onto the camcorder.


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3. What is the difference between a PAL and NTSC camcorder?

In North America, the video system used is called NTSC. Overseas, the video system s typically PAL. These systems are incompatible with each other.


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4:What is the difference between the many video formats? 
Camcorders come in a wide range of different formats, each format being drastically different from each other. Here's a breakdown of the different formats and what makes them unique:

VHS/VHS-C
The lowest quality camcorder. These camcorders record directly onto a VHS tape, which you can take out of your camcorder and put directly into your VCR. VHS-C is a compact form of VHS. Smaller in cassette size, the VHS-C format is more convenient since you can use an adapter to play a VHS-C tape in your VCR.
S-VHS
Not as widely used as it used to be. The S-VHS or Super VHS format holds more lines of resolution and will give you a better image quality. However, an S-VHS tape will not play in a normal VHS VCR. You need an S-VHS VCR to play an S-VHS tape.
8mm/Hi8/Digital 8
More inexpensive than DV camcorders, 8mm camcorders record at a high resolution and can usually record up to 2 hours of quality recording on each tape. Sony introduced the Digital 8 series of camcorders which records data digitally onto Hi8 tapes.
MiniDV/DV (or digital video)
DV is the highest level of consumer camcorders. These record at 500+ lines of resolution and can be used with the ultra compact DV-Mini tapes.
Beta/DVCAM
These are the highest formats and are considered television broadcast quality. Generally, these are the formats used by major television stations.

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Bluetooth Products Using Tips




General frequently asked questions about bluetooth products.

1. I would like more information about Bluetooth wireless technology?

if you need a more technical explanation on the technology or its development, please visit www.bluetooth.org.


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2. Is Bluetooth practical for use with mobile devices? 
Yes. One concern for mobile computing users is power consumption. Bluetooth radios are very low power, drawing as little as 0.3mA in standby mode and 30mA during sustained data transmissions. Bluetooth radios alternate among power-saving modes in which device activity is lowered to maximize the mobile power supply.

That is why we have Bluetooth Headset.


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3. What is Bluetooth? 
Bluetooth is the name for a short-range radio frequency (RF) technology that operates at 2.4 GHz and is capable of transmitting voice and data. The effective range of Bluetooth devices is 30 feet (10 meters). Bluetooth transfers data at the rate of 1 Mbps, which is from three to eight times the average speed of parallel and serial ports, respectively.


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4. What is the difference between Bluetooth wireless technologies and other technologies, such as UWB, 802.11g, 802.11a, 802.11b, WLAN, Wi-Fi, AirPort, Infrared, and Zigbee? 
While there are many differences, key among them are range, power consumption and intended use. Bluetooth wireless technology in its most common implementations has a range of 30 feet (10m), is low-power consuming, designed for battery operated mobile devices and provides voice, data and audio connections between devices.


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5. Why is the technology called Bluetooth? 
The heart of the Bluetooth brand identity is the name, which refers to the Danish king Harald "Bluetooth" Blaatand who unified Denmark and Norway. In the beginning of the Bluetooth wireless technology era, Bluetooth was aimed at unifying the telecom and computing industries.


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6. Why Use a Bluetooth headset? 
Bluetooth headsets are considerably more expensive than regular corded headsets (or no headset at all!). They are also somewhat more complicated to set up, and you then have the added complication of having to keep their battery charged.

Firstly, whether Bluetooth or not, you should try and always use some type of headset with your cell phone. This will vastly reduce the amount of radiation that you're pumping out of the phone and into your brain - some scientists believe this radiation could be harmful, although studies to date have been inconclusive.

In some states and countries, you are not allowed to hold a cell phone while driving, and the use of some type of headset is mandatory. Even if it is still legal to hold a cell phone and drive, it is safer to avoid this whenever possible.

A simple wired headset is a satisfactory solution for many people, but it literally ties you to your cell phone. With a Bluetooth headset you can have your cell phone in your briefcase on your car's back seat, and still place and receive calls.


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7. Will Bluetooth and Wireless LAN (WLAN) interfere with each other?

No, both Bluetooth and WLAN (Wireless Lan) can co-exist. Since Bluetooth devices use Frequency Hopping and most WLANs use Direct Sequence Spreading techniques they each appear as background noise to the other and should not cause any perceivable performance issues.


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8. Will other RF (Radio Frequency) devices interfere with Bluetooth Devices?

No. Bluetooth radios operate on the unlicensed 2.4 GHz (Industrial, Scientific and Medical) frequency band that is shared among other devices (microwave ovens, cordless phones, garage door openers, etc. ). Bluetooth radios switch frequencies at such a rapid pace (1,600 times per second) and the data packets are so small that interference from other RF sources is highly unlikely. Bluetooth is a robust communication system.



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Audio Using Tips



General frequently asked questions about audio products.

1.What is "Frequency Response"? 
Frequency response is the measure of any system's response at the output to a signal of varying frequency (but constant amplitude) at its input. It is usually referred to in connection with electronic amplifiers and similar systems. The frequency response is typically characterized by the magnitude of the system's response, measured in dB, versus frequency.
The frequency response of a system can be measured by:

Applying an impulse to the system and measuring its response (see impulse response)
Sweeping a constant-amplitude pure tone through the bandwidth of interest and measuring the output level
Applying a maximum length sequence

Once a frequency response has been measured (e.g., as an impulse response), providing the system is linear and time-invariant, its characteristic can be approximated with arbitrary accuracy by a digital filter. Similarly, if a system is demonstrated to have a poor frequency response, a digital or analog filter can be applied to the signals prior to their reproduction to compensate for these deficiencies.

Frequency responses curves are often used to indicate the accuracy of amplifiers and speakers for reproducing audio. As an example, a high fidelity amplifier may be said to have a frequency response of 20 Hz - 20,000 Hz +/- 1dB. This means that the system amplifies all frequencies within that range within the limits quoted. "Good frequency response" therefore does not guarantee a specific fidelity, but only indicates that a piece of equipment meets the basic frequency response requirements.

Human beings are capable of hearing between 20Hz to 20kHz. Frequencies at or even above and below this may be relevant (sub bass, high harmonics).


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2.What is Amplifier? 
A component that increases the gain or level of an audio signal.


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3.What is Bass? 
Low frequencies; those below approximately 200 Hz.


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4.What is Bi-Wiring? 
A method of connecting an amplifier or receiver to a speaker in which separate wires are run between the amp and the woofer and the amp and the tweeter.


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5.What is Coaxial? 
A speaker typically with one driver in the middle of, and on the same axis as, another driver.
An audio or video cable with a single center pin that acts as the hot lead and an outer shield that acts as a ground.


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6.What is Decibel (dB)? 
A logarithmic measurement unit that describes a sound's relative loudness, though it can also be used to describe the relative difference between two power levels. A decibel is one tenth of a Bel. In sound, decibels generally measure a scale from 0 (the threshold of hearing) to 120-140 dB (the threshold of pain). A 3dB difference equates to a doubling of power. A 10dB difference is required to double the subjective volume. A 1dB difference over a broad frequency range is noticeable to most people, while a 0.2dB difference can affect the subjective impression of a sound.


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7.What is Impedance? 
A measure of the impediment to the flow of alternating current, measured in "ohms" at a given frequency. Larger numbers mean higher resistance to current flow.


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8.What is Sensitivity? 
A measurement (in dB) of the sound-pressure level over a specified frequency range created by a speaker driven by 1 watt (2.83V at 8 ohms) of power with a microphone placed 1 meter away.



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Audio

General frequently asked questions about audio products.

1.What is "Frequency Response"? 
Frequency response is the measure of any system's response at the output to a signal of varying frequency (but constant amplitude) at its input. It is usually referred to in connection with electronic amplifiers and similar systems. The frequency response is typically characterized by the magnitude of the system's response, measured in dB, versus frequency.
The frequency response of a system can be measured by:

Applying an impulse to the system and measuring its response (see impulse response)
Sweeping a constant-amplitude pure tone through the bandwidth of interest and measuring the output level
Applying a maximum length sequence

Once a frequency response has been measured (e.g., as an impulse response), providing the system is linear and time-invariant, its characteristic can be approximated with arbitrary accuracy by a digital filter. Similarly, if a system is demonstrated to have a poor frequency response, a digital or analog filter can be applied to the signals prior to their reproduction to compensate for these deficiencies.

Frequency responses curves are often used to indicate the accuracy of amplifiers and speakers for reproducing audio. As an example, a high fidelity amplifier may be said to have a frequency response of 20 Hz - 20,000 Hz +/- 1dB. This means that the system amplifies all frequencies within that range within the limits quoted. "Good frequency response" therefore does not guarantee a specific fidelity, but only indicates that a piece of equipment meets the basic frequency response requirements.

Human beings are capable of hearing between 20Hz to 20kHz. Frequencies at or even above and below this may be relevant (sub bass, high harmonics).


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2.What is Amplifier? 
A component that increases the gain or level of an audio signal.


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3.What is Bass? 
Low frequencies; those below approximately 200 Hz.


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4.What is Bi-Wiring? 
A method of connecting an amplifier or receiver to a speaker in which separate wires are run between the amp and the woofer and the amp and the tweeter.


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5.What is Coaxial? 
A speaker typically with one driver in the middle of, and on the same axis as, another driver.
An audio or video cable with a single center pin that acts as the hot lead and an outer shield that acts as a ground.


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6.What is Decibel (dB)? 
A logarithmic measurement unit that describes a sound's relative loudness, though it can also be used to describe the relative difference between two power levels. A decibel is one tenth of a Bel. In sound, decibels generally measure a scale from 0 (the threshold of hearing) to 120-140 dB (the threshold of pain). A 3dB difference equates to a doubling of power. A 10dB difference is required to double the subjective volume. A 1dB difference over a broad frequency range is noticeable to most people, while a 0.2dB difference can affect the subjective impression of a sound.


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7.What is Impedance? 
A measure of the impediment to the flow of alternating current, measured in "ohms" at a given frequency. Larger numbers mean higher resistance to current flow.


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8.What is Sensitivity? 
A measurement (in dB) of the sound-pressure level over a specified frequency range created by a speaker driven by 1 watt (2.83V at 8 ohms) of power with a microphone placed 1 meter away.



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Monday, 11 June 2007


Replacement Inkjet Cartridge for BROTHER MFC-3240C




Color:Black
Compatible Part Numbers:
BROTHER MFC-3240C
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

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Replacement Inkjet Cartridge for BROTHER MFC-3220C




Color:Black
Compatible Part Numbers:
BROTHER MFC-3220C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC-31BK LC800BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX 1815C Brother FAX 1820C Brother FAX 1920CN
Brother MFC-3220C Brother MFC-3320CN Brother MFC-3420C
Brother MFC-3820CN



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Replacement Inkjet Cartridge for BROTHER MFC-3200C



Color:Black
Compatible Part Numbers:
BROTHER MFC-3200C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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Replacement Inkjet Cartridge for BROTHER MFC-3100C




Color:Black
Compatible Part Numbers:
BROTHER MFC-3100C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC21BK LC600BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX 1800C Brother MFC-3100C Brother MFC-3200C
Brother MFC-5100C Brother MFC-5100J Brother MFC-5200C
Brother MFC-5200J Brother MFC-580 Brother MFC-590
Brother MFC-890



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Replacement Inkjet Cartridge for BROTHER MFC-210C




Color:Black
Compatible Part Numbers:
BROTHER MFC-210C
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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Replacement Inkjet Cartridge for BROTHER MC-3000




Color:Black
Compatible Part Numbers:
BROTHER MC-3000
Content: 22.00ml
Box size : 60x25x85x40 mm
Condition: Brand new, 1 year warranty!


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Replacement Inkjet Cartridge for BROTHER FAX MFC PRO 700C




Color:Black
Compatible Part Numbers:
BROTHER FAX MFC PRO 700C
Content: 22.00ml
Box size : 60x25x85x40 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC01BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX MFC-7000C Brother FAX MFC-7200C Brother FAX MFC PRO 700C
Brother MC-3000



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Replacement Inkjet Cartridge for BROTHER FAX MFC-7200C




Color:Black
Compatible Part Numbers:
BROTHER FAX MFC-7200C
Content: 22.00ml
Box size : 60x25x85x40 mm
Condition: Brand new, 1 year warranty!


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Replacement Inkjet Cartridge for BROTHER FAX MFC-7000C




Color:Black
Compatible Part Numbers:
BROTHER FAX MFC-7000C
Content: 22.00ml
Box size : 60x25x85x40 mm
Condition: Brand new, 1 year warranty!

This inkjet cartridge can replace the following part numbers:
BROTHER :
LC01BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX MFC-7000C Brother FAX MFC-7200C Brother FAX MFC PRO 700C
Brother MC-3000


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Replacement Inkjet Cartridge for BROTHER FAX 2440C




Color:Black
Compatible Part Numbers:
BROTHER FAX 2440C
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


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Replacement Inkjet Cartridge for BROTHER FAX 1940CN



Color:Black
Compatible Part Numbers:
BROTHER FAX 1940CN
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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Replacement Inkjet Cartridge for BROTHER FAX 1920CN




Color:Black
Compatible Part Numbers:
BROTHER FAX 1920CN
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!

This inkjet cartridge can replace the following part numbers:
BROTHER :
LC-31BK LC800BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX 1815C Brother FAX 1820C Brother FAX 1920CN
Brother MFC-3220C Brother MFC-3320CN Brother MFC-3420C
Brother MFC-3820CN



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Replacement Inkjet Cartridge for BROTHER FAX 1820C




Color:Black
Compatible Part Numbers:
BROTHER FAX 1820C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!

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Replacement Inkjet Cartridge for BROTHER FAX 1815C




Color:Black
Compatible Part Numbers:
BROTHER FAX 1815C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC-31BK LC800BK




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother FAX 1815C Brother FAX 1820C Brother FAX 1920CN
Brother MFC-3220C Brother MFC-3320CN Brother MFC-3420C
Brother MFC-3820CN



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Replacement Inkjet Cartridge for BROTHER FAX 1800C




Color:Black
Compatible Part Numbers:
BROTHER FAX 1800C
Content: 25.00ml
Box size : 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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Replacement Inkjet Cartridge for BROTHER DCP 4020C




Color:Black
Compatible Part Numbers:
BROTHER DCP 4020C
Content: 22.00ml
Box size : 77x25x105x25 mm
Condition: Brand new, 1 year warranty!

This inkjet cartridge can replace the following part numbers:
BROTHER :
LC07BK LC25BK LC700BK





This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother DCP 4020C Brother MFC-4420C Brother MFC-4820C


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Replacement Inkjet Cartridge for BROTHER DCP 310CN




Color:Black
Compatible Part Numbers:
BROTHER DCP 310CN
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

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Replacement Inkjet Cartridge for BROTHER DCP 110C



Color:Black
Compatible Part Numbers:
BROTHER DCP 110C
Content: 20.00ml
Box size : 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y




This inkjet cartridge is compatible with the following printers:

BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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BROTHER LC950Y Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC950Y
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

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BROTHER LC950M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC950M
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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BROTHER LC950C Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC950C
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC950BK Inkjet Cartridge Replacement



Compatible Part Numbers:
BROTHER LC950BK
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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BROTHER LC950 Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC950
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC900Y Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC900Y
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

Availability: In Stock

Original Price: UK £ 2.72
Special Price: UK £2.52 inc vat


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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BROTHER LC900M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC900M
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC900C Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC900C
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!

Availability: In Stock

Original Price: UK £ 2.72
Special Price: UK £2.52 inc vat


This inkjet cartridge can replace the following part numbers:
BROTHER :
L900 LC41 LC47BK
LC47C LC47MLC47Y LC900BK
LC900C LC900M LC900Y
LC950 LC950BK LC950C
LC950M LC950Y





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 110C Brother DCP 310CN Brother Fax 1940CN
Brother FAX 2440C Brother MFC-210C Brother MFC-3240C
Brother MFC-3340CN Brother MFC-3342CN Brother MFC-410CN
Brother MFC-420CN Brother MFC-5440CN Brother MFC-5840CN
Brother MFC-620CN DCP-115C DCP-117C
DCP-120C DCP-315CN DCP-340CW
MFC-215C MFC-425CN MFC-640CW



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BROTHER LC900BK Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC900BK
Color:Black
Content: 20.00ml
Box size: 65x36x85x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC800Y Inkjet Cartridge Replacement



Compatible Part Numbers:
BROTHER LC800Y
Color:Yellow
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC800M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC800M
Color:Mgaenta
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!



This inkjet cartridge can replace the following part numbers:
BROTHER :
LC-31M LC800M





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother FAX 1815C Brother FAX 1820C Brother FAX 1920CN
Brother MFC-3220C Brother MFC-3320CN Brother MFC-3420C
Brother MFC-3820CN



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BROTHER LC800 C Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC800 C
Color:Cyan
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!

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BROTHER LC800BK Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC800BK
Color:Black
Content: 25.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC-31BK LC800BK





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother FAX 1815C Brother FAX 1820C Brother FAX 1920CN
Brother MFC-3220C Brother MFC-3320CN Brother MFC-3420C
Brother MFC-3820CN



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BROTHER LC700Y Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC700Y
Color:Yellow
Content: 18.00ml
Box size: 67x25x105x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC700M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC700M
Color:Mgaenta
Content: 18.00ml
Box size: 67x25x105x25 mm
Condition: Brand new, 1 year warranty!

Availability: In Stock

Original Price: UK £ 2.37
Special Price: UK £2.19 inc vat


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC07M LC25M LC700M






This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 4020C Brother MFC-4420C Brother MFC-4820C



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BROTHER LC700C Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC700C
Color:Cyan
Content: 18.00ml
Box size: 67x25x105x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC700BK Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC700BK
Color:Black
Content: 22.00ml
Box size: 77x25x105x25 mm
Condition: Brand new, 1 year warranty

This inkjet cartridge can replace the following part numbers:
BROTHER :
LC07BK LC25BK LC700BK






This inkjet cartridge is compatible with the following models:
BROTHER :
Brother DCP 4020C Brother MFC-4420C Brother MFC-4820C


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BROTHER LC600Y Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC600Y
Color:Yellow
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC600M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC600M
Color:Mgaenta
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC600C Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC600C
Color:Cyan
Content: 13.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


This inkjet cartridge can replace the following part numbers:
BROTHER :
LC21C LC600C





This inkjet cartridge is compatible with the following models:
BROTHER :
Brother FAX 1800C Brother MFC-3100C Brother MFC-3200C
Brother MFC-5100C Brother MFC-5100J Brother MFC-5200C
Brother MFC-5200J Brother MFC-580 Brother MFC-590
Brother MFC-890



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BROTHER LC600BK Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC600BK
Color:Black
Content: 25.00ml
Box size: 63x30x85x30 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC50Y Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC50Y
Color:Yellow
Content: 13.00ml
Box size: 55x25x85x25 mm
Condition: Brand new, 1 year warranty!


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BROTHER LC50M Inkjet Cartridge Replacement




Compatible Part Numbers:
BROTHER LC50M
Color:Mgaenta
Content: 13.00ml
Box size: 55x25x85x25 mm
Condition: Brand new, 1 year warranty!


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