Ambidextrous design works equally well for both right-handed and left-handed users Wireless connection via Bluetooth 4.0 LE or USB nano receiver 2.4 GHz wireless connection Award-winning Scroll Ring lets you scan up and down pages with ease Large ball is designed as a perfect sphere to provide exceptional precision Detachable wrist rest supports hand and wrist for ergonomic comfort Auto-sleep helps conserve AA battery life Compatibility: Chrome OS 44, Mac OS 10.8, Mac OS 10.9, Mac OS X 10.10, Mac OS X 10.11, Windows 10, Windows 7, Windows 8, Windows 8.1 Wireless Type: 2.4Ghz, Bluetooth 4.0 LE