Kensington Orbit Trackball MouseKensington Orbit Trackball Mouse Users of the Kensington Orbit Trackball Mouse may make the most of their trackball whether they are right or left handed. The amazing customizability of TrackballWorks software and the superior accuracy of Optical Tracking Technology come together in the cursor movement. Has a medium ball and scroll ring for fine tracking and control. For ergonomic comfort, a retractable wrist rest supports the hand and wrist. Windows