Wireless Doorbell Operating At Over 500-feet Range with 52 Chimes, 1 Receiver and 2 Remote Transmitter(No Batteries Required for Receiver Pure high precision electronic materials; A stylish modern design in classic white! Operating range of over 500 feet. (1000 feet in open area). Remote transmitter button is rated IP44 weatherproof and acceptable for outdoor use. 52 different ring tones. Four levels of adjustable volume from 25db to 110db.Easily plug receiver into an electrical outlet (no batteries required for main receiver). CE, FCC, RoHS certified. Includes 1 plugin receiver unit and 2 remote transmitter button, double sided sticker, anchors, screws, and battery for remote transmitter. ELELINK provide 12-month warranty and friendly customer service.