... 3.3cm(Approx)Three colors for selection: Black, Blue, Red. RF carrier:2402MHz-2480MHzRF operation channel:16,auto frequency hoppingRated voltage ... )4 keys (left, right, scroll, resolution option)Superior wireless optical sensor.For home or office use.Specification: 2.4GHz digital ... , operation distance is up to 10 meters.Built-in mouse memory, no recoding is needed after battery replacement.Intelligent ...