The babymoov premium care transmitter works with the babymoov premium care baby monitor allowing you to monitor another room or child using the same parent unit babymoov premium care baby monitor features line of sight range of 1400 meters with two way talk can operate with 2 transmitters the best to look after 2 babies night light function voice activated or continuous adjustable volume of the receiver and sensibility of the microphone automatic channels search amp vocie activation low