NO HUB REQUIRED: this smart doorbell button uses wi-fi - if internet connection is lost, this device will continue to function as a regular push button doorbell 2-MELODIES: features two mechanical melodies to choose from - Ding-Dong or Ding - with 85dB loudness COMPATIBILITY: Doorbell Chime: compatible with most wired video doorbells - no additional power modules required; Doorbell Button: compatible with any Heath Zenith wireless chime INSTALLATION: the chime box can be installed vertically or horizontally in your home WARRANTY: this smart doorbell kit is guaranteed with a 1-year limited manufacturer's warranty