High-precision trackball features a comfortable, thumb-controlled design that is ideal for extended right-handed or left-handed use. Whichever hand you use, this mouse keeps you comfortable and supported all day - and stays in one place. Large trackball improves control while reducing hand and wrist motion. Fingertip control allows fast, accurate cursor movement. Marble optical technology delivers smooth, ultra-precise tracking. Convenient Forward and Backward buttons help you get around the web with ease. Trackman Marble Trackball is compatible with Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Mac OS X 10.5 or later and Chrome OS.