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