Solid Brass Avalon Style Door Bell (Polished Chrome Finish). Measures 2 5/8 Inches by 1 1/2 Inches. Direct screw mount and connects on normal door bell voltage with two common wires. Uses 24 Volt maximum (standard doorbell circuits). Includes all necessary mounting hardware. This door bell is available in several designer finishes including: polished brass, antique brass, oil rubbed bronze, polished chrome, and brushed nickel.