optical tracking technology for superior cursor control and accuracy medium 40mm ball is designed as a perfect sphere to provide exceptional precision compact footprint takes up less desk space than you d need to operate a mouse ambidextrous design works equally well for both right-handed and left-handed users plug and play installation via wired usb connection trackballworkstm software lets you customize the 2 buttons, adjust cursor speed compatible with windows 8 compatibility: chrome os 44 and above, mac os 10.8, mac os 10.9, mac os high sierra 10.13, mac os sierra 10.12, mac os x 10.10, mac os x 10.11, vista, windows 10, windows 7, windows 8, xp