WIRED 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 IDEAL SIZE: Wired door chime measures 2.386" x 5.492" x 8.268", perfect for your home. Please view our instillation guide at the bottom of the page. Two-note chime for front door, single-note for second door Uses a 16-Volt transformer (C905), sold separately White textured finish 8-1/8-Inch wide x 5-1/2-Inch high x 2-Inch deep Replaces NuTone LB12WW and Broan RC105