JOOAN L2 Doorbell Wireless Premium Portable Waterproof Doorbell kit with 1 Remote Push Button Transmitter and 1 Door Chime 1000ft Range with 36 Chimes, No Batteries Required for Receiver Use the waterproof wireless door chime for front, side, or back doors to gain security and peace of mind. Doorbell kit of 1 push button (transmitter) and 1 door chime (receiver) supports a wireless range of up to 900 ft. 36 different ring tones. Operating range of 900 feet in open area. Three levels of adjustable volume from 25db to 85db. The door chime(receiver) can be plugged into a standard electrical outlet; Hope you enjoy the product, and any problem or suggestion pls do not hesitate to contact us firstly. Thanks a lot ! !(Customer service email:technicalreply@qacctv.com; Skype: market@qacctv.com).Service online: 5 PM ~ 2 AM (PST).