Door chime from Broan is designed for one or two doors, Broan RC210 real wood door chime with an unfinished design, Door chime has two notes for front door and one note for second door, Harmonic testing for precise tonal quality, Complete installation instructions included inside carton, Requires 16 volt transformer (broan model c905), chime buttons and chime wire (not included), Materials: Wood, Dimensions: 7x9x3 SKU: CITPNT242