All day comfort and scrolling come together in the Orbit Trackball with Scroll Ring. The awardwinning scroll ring allows you to spin through web pages and long documents without the need for clicking. It offers better ergonomics with less wrist and hand movement that will ease the pain of repetitivestress injuries. KensingtonWorks software gives you the opportunity to assign specific functions to your 2 buttons 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.FEATURES BENEFITSAwardwinning Scroll Ring lets you scan up and down pages with easeMedium 40mm ball is designed as a perfect sphere to provide exceptional precisionKensingtonWorks software lets you customize the 2 buttons adjust cursor and scrolling speedOptical tracking technology for superior cursor control and accuracyDetachable wrist rest supports hand and wrist for ergonomic comfortAmbidextrous design works equally well for both righthanded and lefthanded usersPlug Play installation via wired USB connectionPC and Mac compatible This product ships in approximately 1 days