BooTaa Wireless Doorbell with 1000 feet 36 Chimes IP44 Waterproof Transmitter 4 Level Ajustable Volume Plug-in Push Button No batteries required for the receiver. Simply plug it into a power supply (110V-240V). Screws and double-sided adhesive tapes included for easy installation of the transmitter. 12V 23A battery for transmitter is included. wireless doorbell operating at 1000 feet in open area. 36 different chimes. 4 levels of adjustable ringing volume, CE,FCC,RoHS certified. Remote transmitter button is rated IP44 weatherproof and acceptable for outdoor use.