NuTone LA139WH Traditional Style Decorative Wired Two-Note Door Chime, White,Broan-NuTone,LA139WH" /> Two-note chime for front door and one-note chime for second door Uses 16-Volt transformer model C905 or new C915, sold separately Can easily replace existing two-note chime without rewiring 10-1/4-Inch wide x 6-3/8-Inch high x 3-3/8-Inch deep Traditional-style design