Kensington® Orbit Optical Trackball Mouse, Usb 2.0, Left/right Hand Use, Black/silver

If you're looking for a simple way to transition from a mouse to a trackball, trust the Orbit® Optical Trackball. It offers better ergonomics, with less wrist and hand movement to ease repetitive-stress injuries. Optical tracking technology delivers

• Optical tracking technology for superior cursor control and accuracy.
• Medium 40 mm ball is designed as a perfect sphere to provide exceptional precision.
• Compact footprint takes up less desk space than you'd need to operate