24GHz Free moving in 10 meters16 automatically switchabel working frequency and over 60000 groups of secure encoding to free external interfereNano super Mini receiver. Plug-and-PlayBuilt-in storage medium,no need re-code after you replace batteryResolution frequency800-1200CPIconversionColorsilvermaterial: plasticBuilt-in Mini receiver design On/OFF functionEnergy saving technology2 pieces of AAA alkaline battery supply over 3 months working time.Low-Voltage alarming functionOperation will be affected greatly due to using environmentBattery life will be different,depending on personal habit of using miceSpecifications: Supply: 2 x AAA Batteries (Not Included)Mouse type: Wireless Optical MouseInterface: USBButton: 5 Buttons + 1 Scroll WheelResolution: 800 to 1200DPISupports: Windows 2000/XP/Vista/MESize: 394" x 236" x 138"(L x W x H)Weight: 409 ozRated working Voltage:30VRated working Current:15mAPackage Includes:1 x 24G Wireless Mouse1 x Mini ReceiverNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm.