Microsoft 2000 wireless optical mouse Microsoft 2.4 GHz wireless delivers a reliable connection with up to a 30 foot range, with virtually no interference BlueTrack Technology Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on most surfaces Comfort and control for either hand Experience full-size comfort, with rubber side grips for control and cushioning and a shape that fits either hand Tilt Wheel Easy horizontal and vertical scrolling. Windows 7, Windows Vista, Windows XP (excluding Windows XP 64-bit), Mac OS X v10.4 - 10.6 2 AA Batteries required (included) Black Manufacturer Reference: 36D-00004