These door entry panels come complete with a 40 code (25 switchable) programmable keypad built in and will work with any SRS door entry equipment. Larger panels (ie with more buttons) are available in both BS316 stainless steel and polished brass. Choice of stainless steel (BS316) panels from 1 button to 10 buttons. These flush mounting door entry panels have hinged front plate, terminal strip to simplify the button connections and built in speaker unit. The front plate is secured to the back box with 4 x SRS stainless steel tamper resistant screws. Panels are not engraved. The keypad has 40 x 4 digit codes and is user programmable.