PLUG-IN DOORBELL: White receiver features two chimes so you'll always know which door your visitor is at CLASSIC STYLE: Doorbell features a timeless white textured finish that will match any decor TWO TONES: Includes two chimes - 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 and to remove the worry of batteries dying ORDER MULTIPLES: Perfect for housing projects, order as a standard pack of 24 to assist with your planning and stay fiscally responsible