2-MELODIES: features two mechanical melodies to choose from - Ding-Dong or Ding - with 85dB loudness SMART COMPATIBILITY: compatible with most standard power modules used with smart wired doorbell buttons REQUIREMENTS: this 2-tune doorbell chime requires: a 16VAC-10VA low voltage transformer, bell wire, and a wired doorbell button (not included) INSTALLATION: this chime box can be installed vertically or horizontally - instruction sheet included WARRANTY: this mechanical doorbell chime is guaranteed with a 1-year limited manufacturer\'s warranty WHITE PLASTIC CONSTRUCTION: with a neutral color palette you can easily place this box anywhere in your home, without being an eye-sore DOORBELL BUTTON (NOT INCLUDED): works with ANY wired doorbell button rated for at least 16VAC - ideal for wired doorbell chimes and new home installations › See more product details