Kensington Orbit Trackball with Scroll Ring

The Orbit Trackball with Scroll Ring from Kensington is a desktop trackball with a USB interface. It features a symmetrical design, making it easy for both right- and left-handed users to operate. Optical tracking technology and a scroll ring make it easy to move your cursor and scroll through web pages. It is compatible with Windows XP, Vista, 7, and Mac OS X.