Description: The push button transmitter (Outdoor Unit) is powered by 1pcs 12V 32A battery. Indoor receiver unit is powered by 2pcs AA batteries. (Battery is not included). 38 melodies and 3 levels adjustable voice volume, reminding you the coming of your guests by lovely songs. Design with led indicator, more practical and convenient. All day long anti-interference system, avoid interferences outside or between neighbors. Simple and easy wireless installation, just plug and go; save troubles and money. Specification: Transmitter Size: approx. 78x42x20mm/3.07x1.65x0.79 inches Receiver Size: approx. 95x65x30mm/3.74x2.56x1.18 inches Working Distance: 100 meters Material: Plastic Package Includes: 1 Piece Transmitter 1 Piece Receiver
