Heath/Zenith SL-6164-B Wireless Battery-Operated Musical Door Chime Kit with 64 Tunes, White Wireless battery-operated doorbell system Choose from 64 melodies, including for holidays, patriotic events and other special occasions Up to 100-Feet transmission range Adjustable volume control Chime requires three size D alkaline batteries (not included) and push button is powered by one battery (included)