All-day comfort and scrolling come together in the Orbit Trackball with Scroll Ring. The award-winning scroll ring allows you to spin through web pages and long documents without the need for clicking so you can scan up and down pages with ease. It offers better ergonomics, with less wrist and hand movement that will ease the pain of repetitive-stress injuries. KensingtonWorks™ software gives you the opportunity to assign specific functions to your two buttons, adjust cursor and scrolling speed, and create a truly customized productivity experience. Optical tracking provides smooth and accurate cursor control, and a detachable wrist rest offers terrific ergonomic support when you’re hard at work. Medium 40 mm ball is designed as a perfect sphere to provide exceptional precision. Ambidextrous design works equally well for both right-handed and left-handed users. Plug & Play installation via wired USB connection. PC and Mac® compatible.