CST Laser Trackball Mouse USB 1600 CPI 3 Button w/ Scroll By Ergoguys

The original PC-Trac is re-born again as the L-Trac high performance laser optical trackball. Utilizing the latest in laser navigation technology, the L-Trac has selectable resolutions of 400, 800 and 1600 CPI, which are "button selectable", allowing rapid changes of sensitivity. The high performance laser navigation system is capable of tracking at greater than 30 inches per second, even at a 20G acceleration rate. This means the user can "fly" around the screen with a flick of the finger or snap from one side of the screen to the other with a healthy flick of the arm. Either way, this precision, high performance pointing device produces predictable, quick and precise motion that becomes intuitive in a few minutes of use.