2 1/2 inch Solid Brass doorbell button (Antique brass finish) - measures 2 1/2 inch by 1 1/2 inch. Uses 24 volt maximum (standard doorbell circuits). This button has a center to center mounting distance of 1 3/4 inch. Button is made from color matching resin material. Comes complete with mounting hardware. Available in Polished Brass, Antique Brass (shown), Oil Rubbed Bronze, Polished Chrome, Brushed Nickel, and Flat Black finishes.