Westinghouse T00405 Wireless Door Chime Kit with Cordless Button and Plug-in Receiver No wires or batteries - easy way to add a doorbell Transmits the signal through doors, walls and floors up to 100 feet (30.5m) away 6 selectable frequency codes to prevent outside interference Contains a push button door chime and receiver that plugs right into an outlet Westminster or ding dong chime melody with adjustable volume control