Features Scroll Ring and Medium Ball Spin the dial to move up and down web pages or documents with complete ease. The 40mm silver ball's hard surface is specially designed as a perfect sphere for precise tracking and control. TrackballWorks™ Customization Free downloadable software provides a personalized experience, giving you the ability to assign a variety of functions (including shortcuts) to the buttons, and adjust cursor and scrolling speed. Optical Tracking Technology Delivers precise cursor movement for superior accuracy, so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency. Detachable Wrist Rest Soft cushioning supports the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer. Ambidextrous Design Works equally well for right-handed and left-handed users. Plug-and-Play Installation on Mac or PC Quickly get clicking and scrolling with fast, simple installation through the reliable wired USB connection - no batteries required. Sleek White Base with Silver Ball Designed to complement your desktop and office aesthetic. Kensington's trackball legacy continues with the latest addition, the Orbit® Trackball with Scroll Ring - White, designed to complement your desktop and office aesthetic. It includes the features that make the award-winning Orbit® Trackball with Scroll Ring the popular choice of professionals everywhere for everyday precision, productivity, and comfort. The scroll ring lets you spin the dial to move up and down web pages or documents with complete ease. And the 40mm silver ball's hard surface is specially designed as a perfect sphere for precise tracking and control. Free TrackballWorks™ downloadable software provides an even more personalized experience, giving you the ability to assign a wide variety of program functions to each of the two buttons, as well as adjusting cursor and scrolling speeds. Optical tracking technology delivers precise cursor movement for superior accuracy, so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency. A detachable wrist rest delivers soft cushioning to support the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer. Ambidextrous design works equally well for right-handed and left-handed users. Plug-and-play installation lets you get clicking and scrolling on your Mac or PC with fast, simple installation through the reliable wired USB connection - no batteries required. Sleek white base with silver ball is designed to complement your desktop and office aesthetic.