Have you ever been in a back room of your home and missed a visit from friends because you could not hear them knocking? That won't happen again with the use of our Wireless Doorbell. Installs quickly without the hassle of running any wires. Just mount the transmitter near your door and place the receiver anywhere in your home within one hundred feet. When the transmitter button is pressed a pleasant chime will sound. The receiver may be mounted to a wall, set on a table or clipped to your clothing. Requires one 12 volt battery (included) and 3 "AA" batteries (not included).