Detailed Product Description Product features: 1 using ultra-micro-receiver. 2 Operating coverage : 6 meters. 3 Smart automtically sleeping and wake-up,saving power function. 4 power switch protects rechargeable batteries,no power consumed when without being used for a long time. 5 high-capacity lithium battery, charged up with USB interface. 6 comfortable handle, you can be accustomed to operate ...