... cause error sound ,with high interruption resisting.Wireless control distance is 30~20 meters;It has rest waiting ... energy saving function. Both emitter andreceiver will be at rest waiting state until you press the button, ... send out goods-finding signal, receiver will be at rest state. once press emitter 1 or 3 ... ,6 keys and 8 keys series,1 remote control unit can look for several receivers( goods),using ...