Wireless Type: Doorbells Power Source: Battery DIY Supplies: Electrical Transmitter Battery Type:: 23A12V Alkaline Battery (do Not Include) Receiver Battery Type: 3*AAA Batteries (do Not Include) Applicable Space: Home/Office/Villa/Hotel/Hospital/Apartment Waterproof Rated: IP44 New, High Quality ABS Material with LED Light Simple, Wireless Installation, No Wires or Cables Required . Transmitter(remote Control) and Receiver. Waterproof Design . Anti-interference System, Avoid Interferences Between Neighbors . Adjustable Volume and 36 Different Tunes for Your Choice, Effectively Reminds You of the Coming of Guests or Friends . Long Distance Transmission and High Strength Signal and Sensitivity . Remote Control Range Up to 200m in the Open Air, Suitable for Homes and High-rise Building. Package Includes: The Battery NOT Included 1 X Wireless Doorbell Receiver 1 X Doorbell Transmitter.