Battery operated. 2 Sounds. Ding-dong. Ding. Quick and easy installation! Wireless, battery operated push button. Doorbell base. Product Features: Battery operated chime requires 2 c batteries (not included) Transmission range up to 100 feet. Push button with battery included. Product Features: Battery opearted chime required 2 C batteries (not included). Transmission range up to 100 feet. Push button with battery included. 1 Year warranty. www.heath-zenith.com.