Working Principle: 2.4GHz Radio Frequency/16 channels hopping with 2 group form 2.405~2.476GHz Interface: USB Resolution: 800/1600DPI Switch able Buttons: L/M/R Button+Forward /Back Button Receiver: Nano Receiver Distance: 8 Metre Wheel: 1 Mechanical Scrolling Wheel Power Consumption: DC=1.5V 30mA Switch/MTBF: Left/ Right Button:60~80 gf / up to 1kk times-Middle Button: 60~80 gf/ up to 1kk times Dimension: L*W*H: 94.0*64.5*36.0mm(Mouse) L*W*H: 18.3*14.6*6.4mm(Receiver) LED: 1.Low-power indicate-2.DPI switch indicate Battery: AA, Alkaline Manganese Dioxide Battery/With low-voltage alarm and four power-saving mode, Automatic power-off mode. Weight: 58g±0.1g(Mouse);1.8g±0.1g(Receiver) O. S. Supported : Windows 2000,XP,VISTA,2007