LED Mice
Optical mice often use LEDs for illumination, even though they are sometimes colloquially referred to as 'lasers'. The color of the optical mouse's light-emitting diodes can vary, but red is most common, as red diodes are inexpensive and silicon photodetectors are very sensitive to red light. Other colors are sometimes used, such as the blue LED of the V-Mouse VM-101 illustrated at right.
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