12V 23A ALK battery for the push button remote is INCLUDED. Wireless doorbell operating at 600~750 feet in open air.
Over 50 different chimes. 4 levels of adjustable ringing volume from 30~110 dB
No batteries required for the receiver. Simply plug it into a power supply (UK Standard)
Each receiver works with up to 10 transmitters for added security and convenience
Screws and double-sided adhesive tapes included for easy installation of the transmitter