The Kensington Expert Wired Optical Trackball Mouse works well for both right and left handed users to get the most out of their trackball. TrackballWorks software offers incredible customisation and DiamondEye optical tracking technology provides smooth, precise cursor control. With a scroll ring and large ball for precise tracking and control. A detachable wrist rest supports hand and wrist for ergonomic comfort. The trackball is compatible with Windows 11, 10, 8.1, 8, 7 and 10.8, macOS X 10.11, macOS 10.10 or above, macOS 10.9, macOS Sierra 10.12, macOS 10.13 or above and Chrome OS 44 or above.