RuiLing Smart Wireless Remote Doorbell Set,1000 Feet Operating Range,36 Optional Stereophonic Music Chimes,4 Level Adjustable Volume Settings and Flashing LED Indicators,Plug-in Receiver - White Wireless Remote Doorbell Set,1 transmitter button triggers (rings) and 1 chime units (receiver). The Chime units can each be configured to ring with different melodies/ringtones bell home. Long Range and Waterproof, Operating range of over 1000 feet (280m) in open area. 4 levels of adjustable volume from 0db to 85db. IP44 weatherproof (Remote transmitter button, acceptable for outdoor use). 36 different ring tones, A stylish modern design in classic white! Artful with simplicity, elegant and unique. Excellent materials keeps itself from getting higher temperature & interference. Easy Anchor, Easily plug receiver into an electrical outlet ( No Batteries Required for Receiver). CE, FCC, RoHS certified. Package Includes : 1x chime units and 1x remote transmitter button, 1x double sided sticker, 2x anchors and screws, 1x screw tool, and 1x 12V 23A battery for remote transmitter.