MAGINOVO Wirless Doorbell Battery Operated Powered Remote Control 36 Tones with LED Indicator Widely used. Suitable for homes, office buildings, hotels, factories. Doorbell kit of 1 push button and 1 chime; Supports a wireless range of up to 328 feet in open air. Total 36 tones, including the traditional Ding Dong, and 4 levels of sound volume. Flash, ring or flash+ring for function option. Transmitter powered by 12V 23A battery (included); Doorbell Receiver powered by 2 AAA batteries ( not included ) Easy installation, with double-side stickers at the back of the remote button. Please install the doorbell appropriate place, keep away from rain and sunshine.