Features:  Advanced Bluetooth technology eliminates the need for a separate receiver.  Optical mouse with high resolution up to 1000dpi .  Wireless range up to 10 meters (3.3ft).  Sleep mode and On/Off switch for saving energy.  Ergonomic design， very comfortable to use.  Compatible with windows 98， SE， 2000， XP， Vista， windows 7 and server 2003.  Works with Mac OSX v10.2.6， only if your MAC has Bluetooth function.  Please take a Bluetooth dongle first if your computer does not have Bluetooth function.(Bluetooth dongle is not included)  Comes with 1-year warranty.  Specifications:  Color: Black  Maximum resolution: 1000dpi  Wireless range: 10m  Power supply: 2 * AAA alkaline batteries (batteries are not included)  Dimensions: 9.3 * 6.3 * 3.8cm  Weight: 56g  Package size: 22.5 * 15 * 7cm  Package weight: 110g  Package Contents:  1 * Bluetooth Mouse