The chances are you’ll see a red LED light if you’re not seriously old-school and your mouse has a ball, this light serves as the illumination for a very simple camera sensor. The mouse ...

Evolution of computer mice from trackball to optical, translating hand movements into on-screen interactions with precision.

They work by emitting light from an LED or laser, and a CMOS sensor detects the light reflections as the mouse is moved. Early optical mice required a special mouse pad, but modern devices can be ...