Upgrade your home with convenience and versatility using the Utilitech Wireless Battery-Operated Doorbell Kit where modern technology meets seamless functionality. Select from two enchanting mechanical melodies ? Ding or Ding-Dong ? and tailor the volume to your preference with the adjustable volume feature. The battery-operated doorbell push button powered by 1x A23 Battery (included and pre-installed) and the doorbell chime requiring 3x C Batteries (not included) offer a hassle-free setup without the need for hardwiring. With a 100-ft transmission range this kit is ideal for larger homes or work settings allowing you to hear the doorbell from a distance