... battery,easy use,sound activated,factory offer baby monitor,wireless baby camera,audio baby monitor,315Hz/433Hz optional,use battery,easy use ... :Remote Range:50-80M (in open area);Sound Activated: place Transmitter near Baby,Receiver near or together with Mom/Dad.Once ... Temperature: -20°C - +50°C;Use 2 "AAA"Battery for Transmitter;and 2 "AAA" Battery for Receiver;Sound Sensitivity and Crying ...