Roybens Smart Wireless Remote Doorbell Set, 1000 Feet Operating Range, 52 Optional Stereophonic Music Chimes, 4 Level Adjustable Volume Settings and Flashing LED Indicators, Plug-in Receiver - White A stylish modern design in classic white! Artful with simplicity, elegant and unique. Operating range of over 500 feet. (1000 feet in open area). 52 different Stereophonic ringtones. 4 levels of adjustable volume from 25db to 110db. Remote transmitter button is rated IP33 weatherproof and acceptable for outdoor use; CE, FCC, RoHS certified. Includes 1 plug-in receiver unit and 1 remote transmitter button, double sided sticker, anchors, screws, and battery [A23 type] for remote transmitter. (no batteries required for main receiver)