YCZ Wireless Waterproof Remote Doorbell with 1 Remote Button and 2 Plugin,Operating at over 500-feet Range with Over 50 Chimes,No Batteries Required for Receiver, Wood grain,(Dark wood) 52 chimes and 16 chords for selection, the 4 level volume is set, the maximum volume 110 decibel ensure the elder's use. Resist high pressure with excellent design. 300 meters transmission range in the oper area. The actual wireless transmission range depends on your using environment. You will hear the doorbell no matter how loudly inside, so you won't miss each visitor. Easily plug receiver into an electrical outlet (no batteries required for main receiver).High quality for you to have one, as it is more sensitive, more stable, and power effective.