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

When you're looking for a simple way to transition from a mouse to a trackball. It offers better ergonomics, with less wrist and hand movement to ease repetitive-stress injuries. Optical tracking technology delivers precise cursor control and the two-button design provides a familiar experience for mouse converts.

• 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 a mouse.
• Ambidextrous design works equally well for both right-handed and left-handed users.
• Plug-and-play installation via wired USB connection.
• TrackballWorks™ software lets you customize the two buttons, adjust cursor speed.