Technical parameter Adopt "Agilent" chip technology Type of the mouse: Wirelessphotoelectric mouse The button is counted : 2 The gyro wheel is counted : 1 Interface type: USB interface Offering an explanation rate of photoelectricity: 800DPI Use the distance: 3~ 5 meters are operated freely Receive , launch the way: RF Launch frequency: 27MHZ Electric function of automatic province of the latest technology: Launch electric current Electricity hour electric current of 0.024A province: 0. 008A Offer one yard of functions correctly automatically