NuTone LA120WL Decorative Wired Two-Note Door Chime, Walnut Uses a16-Volt transformer(C905), sold separately Dimensions: 6-1/4-Inch x 8-1/8-Inch Walnut wood grain finish on a molded cover with vertical grooves Uses a16-Volt transformer(C905), sold separately Dimensions: 6-1/4-Inch x 8-1/8-Inch Replaces Broan RC121 Can easily replace existing two-note chime without rewiring