Logitech Wireless TrackMan Wheel

Logitech's Cordless TrackMan Wheel is a cordless optical trackball with scroll wheel. Superior digital radio technology requires no line of sight. Patented optical technology smoothly senses motion for longer use - virtually maintenance free. Patented optical sensing technology provides maximum precision, smooth tracking, and eliminates the need for regular cleaning. The tiny black dots on the vibrant red ball are sensors that track the movement with an optical tracking system. Use a Logitech trackball for even the most finely detailed work. Patented digital radio technology provides all the performance of corded peripherals in a six-foot range, and isn't affected by cordless phones or other wireless appliances. Logitech's technology also features a randomly set digital security code for the keyboard and mouse.

Features:
Space saving design of a trackball.
True cordless freedom anywhere up to 6 feet away.
USB and PS/2 connector - works on either Windows or Mac OS.
5-year warranty.
Internet Service Provider (ISP) account required for Full Web Wheel™ functionality.