Sleek and modern in appearance, our two-note, brass Streamline Door Chime has the appealing aerodynamic qualities of lighting, hardware, and furniture found in homes both before and after World War II. Pair with our 4334 Doorbell Button, finished to match, or the 8717, also available in Brushed Nickel.A 16 volt transformer is included. If you are using a previously installed transformer, check for compatible voltage. If you are installing door chimes in a home which has never had one, you'll need to buy bell wire - 18 gauge is sufficient - available through hardware stores. See more items from our Doorbells category. Specifications Item # 3708 Finish Shown Brushed Nickel Height 13.875" Width 9.5" Projection 2.625" Voltage 16V Price As Shown Base Total $155.00 Grand Total $155.00