Kensington Orbit Trackball Mouse (K64327F) Trackball Mouse for comfort and precision Customizable 2-Button design via TrackballWorks software Compatible with Windows (including Windows 8) Compatible with chrome os 44 and above, mac os 10.8, mac os 10.9, mac os x 10.10 or above, mac os x 10.11, mac os sierra 10.12, mac os 10.13 or above, xp and vista Orbit Optical Trackball Mouse Comfortable for left or right-handed users Compact design, stays put and takes up less space It's inexpensive, looks cool and performs well Five year warranty