baby monitor,wireless baby camera,audio baby monitor,315Hz/433Hz optional,use battery,easy use,sound activated,factory offer baby monitor,wireless baby camera,audio baby monitor,315Hz/433Hz ... other sound,Receiver will be activated to sound imitated baby crying;Sound Level: 92±5Db;Frequency: 315MHz, ... -20°C - +50°C;Use 2 "AAA"Battery for Transmitter;and 2 "AAA" Battery for Receiver;Sound Sensitivity ...