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The mouse uses infrared light to pick up signals of movement from the mouse and transfer them to movement on the screen. It is much more accurate and can be faster than the response on a standard ball mouse. If you pick up the mouse and it has a red light shining from the bottom it is an infrared mouse.
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EzraGreater accuracy and less cleaning. Balled mice use two wheeled rollers set at 90 degrees to each other to determine the X/Y movements of the ball and a pinch wheel to keep the ball in contact with both rollers. However, the ball picks up dirt and dust which collects on the wheels which have to be cleaned periodically to ensure reliable usage. An infra-red mouse requires very little maintenance. Besides changing batteries occasionally, any other problem can usually be traced to a hair or other foreign matter being caught in the light aperture which is easily removed with tweezers.
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