Looks a decent enough price for this 4 button trackball mouse.
- Large 55 mm ball for maximum precision, control and comfort and four customizable buttons with Kensington TrackballWorks software
- Save time and increase productivity with the award winning click free Scroll Ring and optical DiamondEye technology delivers superior precision
- Stationary trackball optimises desk space when compared to a mouse and the detachable wrist rest cradles hand in comfort
- Wired 180 cm USB cable provides reliability and avoids need for batteries
- Compatible with Windows and Mac running OS X or later.