The Honeywell DC311N is a wireless, portable doorbell with doorknob. Place the wireless doorknob (so with batteries) at the front door and the receiver anywhere in the house. The receiver and doorknob are already connected straight out of the packaging. As such, it's only a matter of putting them up and your new doorbell works. The range between transmitter and receiver extends up to 150 meters, so keep this in mind when placing the receiver. The receiver has 4 different melodies and a maximum noise level of 80 decibels. Loud enough to hear the doorbell anywhere in the house.