" 44 Crystal Clear Doorbell Chimes: Choose from 44 melodious chimes and 4 volumes to suit your needs. The built-in stereo speaker delivers crisp, clear sound up to 100dB. Only the indicator light flashes blue when someone ring the bell once you turn it to silent. So no annoying ringtone will disturb you when you rest. 200m / 1000ft Operating Range: The doorbell with reliable wireless range of 200m / 1000ft (no obstacles) and strong signal penetration, never fails to alert you when someone shows up at the door. Adopting a protocol superior transmission, it effectively avoids the doorbell triggered by mistake. Installation in Seconds: Simply mount the doorbell transmitter on the wall or desired location using 3M adhesives or screws and plug the receiver into an outlet. No need for wiring or other tools. All accessories Requirements are included in the package for an effortless installation. IP66 Waterproof and Dustproof: This wireless doorbell has IP66 waterproof rating, which is higher than other IP44 waterproof doorbell. It has good performance even in the rain. -4 - 140 high temperature resistance gets to work in difficult conditions a breeze. The rugged design gives you peace of mind. "