Optical mice are the de facto standard for mice to communicate between the end user and the computer. The optical mouse is a great improvement of the mechanical mouse that was created in the early 1970s.
Agilent Technologies introduced the Optical mouse in 1999. The technology uses a tiny camera that takes thousands of pictures per second to determine position and speed.
The optical mouse uses a very small light emitting diode more commonly referred to as an LED, which is red in color. This LED bounces light off of a mouse pad or desk surface onto a CMOS (Complimentary Metal Oxide Semiconductor).
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