Heath/Zenith SL-7366-02 Wireless Plug-In Door Chime Kit with Molded Plastic Cover, White White cover Chime plugs into any standard wall socket Transmission range up to 100 ft. Adjustable volume control Push button with battery included Wireless plug-in doorbell system; Plastic white molded cover 8-note Westminster or traditional 2-note melody for main entrance Up to 100-Feet transmission range Adjustable volume control 1 year warranty