Vintage "Press" Doorbell Button, Solid Brass (Antique Brass Finish). Measures 2 1/2 Inches In Diameter. Direct screw mount and connects on normal door bell voltage with two common wires. Don't be fooled by the Anodized less expensive metal parts - this one is solid brass and finished by hand. Uses 24 Volt maximum (standard doorbell circuits). Includes all necessary mounting hardware. Available finishes include: antique brass (shown), polished brass, and polished chrome.