WIRED DOORBELL: White receiver features two chimes so you'll always know which door your visitor is at CLASSIC STYLE: Classic white cover with vertical panels blends effortlessly with any décor TWO TONES: Includes a two-note chime for the front door and a one-note chime for the back/second door for easy differentiation CONTINUOUS SERVICE: Chime wires to a 16V transformer for uninterrupted service IDEAL SIZE: Plug-in door chime measures 1.42" x 1" x 1", making it the perfect size for your home