... distance,factory OEM offer audio baby monitor,baby camera,sound activated,baby transmitter receiver,use battery,50- ... 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 ... both highly welcomed. Wireless Digital Audio Baby Care Detector Baby Cry Detector