This doorbell button mounts with two brass screws (included) and it has two lead contacts on the back. Measures 2 1/2 inches by 1 1/2 inches. Uses 24 volt maximum (standard doorbell circuits). The center to center mounting distance is 1 3/4 inch. Comes in a Polished Brass, Antique Brass, or Oil Rubbed Bronze finish. The average lead time for this particular product is 2 to 4 Business Days.