Areox Plug in Push Button Door Chimes Remote Wireless Doorbell Completely wireless operation--no wires or cables required.Environment friendly. Over 50 different chimes.4 levels of adjustable ringing volume from 25-110 dB.Operating range of over 300M. Crews and double-sided adhesive tapes included for easy installation of the transmitter. IP44 Waterproof/Dustproof Portable Door-Bell Kit. Widely used:compatible with home furnishing,office buildings,hotels,factories.