Mechanical mouse

Mechanical computer mouseA mechanical mouse is a computer mouse that contains a metal or rubber ball on its under side. When the ball is rolled in any direction, sensors inside the mouse detect this motion and move the on-screen mouse pointer in the same direction. The picture is an example of the bottom of a mechanical mouse with the ball removed. Today, this mouse has been replaced by the optical mouse.

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Also see: Mouse terms, Optical mouse, Optical-mechanical mouse