... baby monitor,315Hz/433Hz optional,use battery,easy use,sound activated,factory offer baby monitor,wireless baby camera,audio baby monitor ... ,315Hz/433Hz optional,use battery,easy use,sound activated,factory offerSpecifications:Remote Range:50-80M (in open area);Sound ... .Once baby is crying or other sound,Receiver will be activated to sound imitated baby crying;Sound Level: 92±5Db;Frequency ...