MAGIOVE 36 Melodies Wireless Battery Operated Powered Remote Control Doorbell with LED Indicator Remote control range up to 100 meters in open air, suitable for homes and high floor houses. Build in anti-interference design, avoid t he interference between users. Sender powered by 12V 23A battery (included); Doorbell Receiver powered by 2 AAA batteries ( not included ) 36 ring Melodies for selection, you can select your favorite Easy to install, with double-side stickers at the back of the remote button. Please install the doorbell appropriate place, keep away from rain and sunshine.