Nihao&Acirc; Wireless Doorbell with 1 Remote Button and 2 Plugin Receivers Operating At Over 500-feet Range with Over 30 Chimes Pushbutton: IP44 Waterproof design; Bionic comfortable button. Volume: 4 levels adjustable from 25db to 110db. Inside: PCB board and IC parts are equipped with strong material, keeping long lifetime; Adopt digital coding it is more stable and can avoid interference. Distance: The wireless distance achieve 150-300 m, better materials keep stable transmitting range. Practical: Easy installation, convenient,with double-side stickers at the back of the remote button, also you can use screw to fix it. It is easy to DIY.