NuTone LA11WH Decorative Wired Two-Note Door Chime, White Textured 8-1/8-Inch wide x 5-1/2-Inch high x 2-Inch Deep Two-note chime for front door, single-note for second door Uses a16-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