Model Number: KS-K72337U Brand Name: Kensington Key Specifications/Special Features: Mfr part number: K72337USFeatures:Scroll ring allows fast, easy scrolling of web pages and documentsUses far less desk space than a mouseOptical technology for precise tracking - no cleaning required

Ambidextrous design for left or right handed users

Click-free scrolling

USB connectivity

PC and Mac compatible

All-day comfort from a world leader in trackball innovation

Certified for Mac OS, Windows 7

Connectivity: wired

Sensor: optical

Controls: programmable, scrolling

Convenience: Plug-and-play, ambidextrous design

Compatibility: Windows 7, Windows XP, Windows Vista, and Mac OS X

Colors: black/blue

Packaging dimensions (WxDxH): 6.0 x 2.0 x 8.0 inches

Gross weight: 0.65lbs