Wireless Doorbell, 1000ft Remote Control Doorbell Kit With Adjustable Volume and Chime, No Battery Required for Receiver Four levels of adjustable doorbell volume from 25db to 110db, and 36 chimes allows to set different ring-tones Wireless RF technology make it reach a distance of up to 1000ft, no need to worry missing any visitor Super power-saving, no batteries required for the receiver, simply plug transmitter into main power socket (120V US Standard) IP44 waterproof transmitter makes it workable and acceptable in Outside, and receiver easily plug into main outlet Top qualified, offer excellent performance. CE, RoHs, FC certificates approved.