Mod-it
Wireless radio trackball with 7 buttons & scroll wheel, 1,600dpi

This mouse relieves your arm! Because you control the mouse pointer via trackball only with your thumb - without moving the mouse.

5 modes for individual speed: Adjust the speed of your trackball from 600 to 1,600 dpi simply by pressing a button! The light color signals which speed you are currently using.

Hours of enjoyment are guaranteed: The ergonomic design is especially gentle on your arms and prevents fatigue! The mouse lies comfortably in your hand even after a long working day or a night of playing.