... distance,alarm crying sound,factory offer baby monitor,child monitor,baby cry detector,sound activated,use battery ... Transmitter,Receiver will be activated to sound baby crying voice.Quite sensitive.•Loud Volume:85- ... ,useful for Mom to take care of baby while baby is sleeping,meanwhile Mom can enjoy the ... 53.2*50CM24.0KGs23.2KGs25,200PCS Wireless Audio Baby Cry Detector Sound Activated Use Battery