Hippus S2WB-LC Wired Light Click Handshoe Mouse (Right Hand, Small, Black) Connection - USB 1.1 (compatible with USB 1.1 and USB 2.0) Separate USB connection on the HandShoeMouse / Battery wireless version is charged with USB cable Control - Two buttons at ergonomic position plus scroll wheel Scroll Wheel - Fitted with Switch Control Mechanism - Standard - optical 800 dpi; BlueRay Track - 1000 dpi Operating Systems - Windows 95, 98, 2000, NT, XP, Vista and Windows 7 / Mac OS 9 or Mac OS X / Unix