The Heath Zenith Wired Doorbell Buzzer works with any wired doorbell button rated for at least 16VAC. The metal design has a silver finish which completes an industrial aesthetic. With 85dB of sound, this is ideal for larger spaces such as, but not limited to, garages, warehouses, and large industrial facilities. Requires a 16VAC-10VA low voltage transformer, a bell wire and a wired doorbell which are not included. Features: Ideal for garages, warehouses, and large industrial facilities Works with any wired doorbell button rated for at least 16VAC Intensity up to 85dB, you'll be able to hear this buzzer in larger spaces Includes 2 mounting screws and 2 wall anchors for easy installation Requires a 16VAC-10VA low voltage transformer, bell wire, and a wired doorbell button (not included) Comes with 1 metal buzzer, 2 screws, 2 wall anchors and instructions sheet Covered by a 1 year Specifications: Height: 5-1/8" Width: 1-5/8" Depth: 4-5/16"