Input Devices : Tracker Ball

A tracker ball (or trackball) is an alternative to a mouse. It operates in the same way as a mouse except that the ball is on top. Turning the ball with your hand moves the pointer on the screen.

Tracker balls are popular when there is not enough space for a mouse, e.g. in portable computers. Most tracker balls have buttons next to them which can be used to select options from the screen.

GCSE ICT Companion 04 - (C) P Meakin 2004