NuTone LA126WH Compact Classic Design Decorative Wired Two-Note Door Chime, White N/A Imported 8-Inch wide x 6-Inch high x 2-1/4-Inch Deep Compact, classic design Molded plastic cover Two-note chime for front door, single-note for second door Uses a16-Volt transformer(C905), sold separately 8-Inch wide x 6-Inch high x 2-1/4-Inch deep