iClever HI-925-B Wireless Doorbell with Battery for Receiver, Black Doorbell kit of 1 push button (transmitter) and 1 door chimes (receivers) supports a wireless range of up to 600ft/180m Over 52 different ring tones. Operating range of over 600 feet. Four levels of adjustable volume from 25db to 110db. One door chime can be plugged into an electrical outlet in your home, and the other is powered by 3 AAA batteries (not included) Blue LED flashes when someone knocks at your door. And the sleek design easily blends with the decor of your home Easy to install,super-low power consumption design, power-saving mode