... ,audio baby monitor,315Hz/433Hz optional,use battery,easy use,sound activated,factory offerSpecifications:Remote Range:50-80M (in open area ... .Once baby is crying or other sound,Receiver will be activated to sound imitated baby crying;Sound Level: 92±5Db;Frequency: 315MHz, ... high standard to all our items. We also provide a complete,one-stop service,with experienced and qualified personnel working with ...