... be at rest waiting state until you press the button,then it will start working! Power- consuming ... rest state. once press emitter 1 or 3 button,then the counter receiver will begin to work, ... . Using once piece of CR2450 button battery,power voltage 3V/capacity 600mah,Battery using longest time is up to ... several receivers( goods),using 1 piece of 12V27A battery,after 6-10 months,please pay attention to ...