Colour: WhiteInterface: USBButtons/Wheel: 2 buttons / 1 wheelTechnology: Laser SensorSensor Resolution: 300 dot/cm (800 dpi)Frequency Band (GHz): 2.4 GHzTransmission Distance (m): 10 m (32 ft.) max. line of sightPower Requirements: DC 1.5 VBattery Life: Approx. 4 months (alkaline battery)Compatibility: Personal computers with Microsoft Windows 7, Windows Vista, or Windows XP (SP2 and after) pre-installed operating systems and equipped with a USB port.Dimensions: Weight: Approx. 71 g (2.6 oz) (including batteries) Height: 31mm Width: 53mm Depth: 112mm