Heath Zenith 47 Traditional D&eacute;cor Series Wired Wall-Sconce Style Door Chime, Satin Nickel Hardwired door chime (powered by 16-volt/10-watt or 16-volt/15-watt transformer) For use with hardwired doorbell systems Distinctive 2- and 1-note chime melodies distinguish front and back doors Wired for use with two doors Satin nickel cover; 9.125 by 1.625 by 5.375 inches