Slim, low-profile trackball provides all-day comfort while the advanced dual laser sensors and large ball deliver exceptional precision. Your computing experience gets smoother, faster and easier. For even greater productivity, the four adjustable buttons can be set to the function or keyboard shortcut you use most with Kensington TrackballWorks software. Choose navigation mode to control cursor and scrolling. Media mode controls volume, play/pause, stop and track forward/backward while view mode zooms in/out and pans. Trackball is compatible with Windows Vista and Mac OS X.