These indoor/outdoor polycarbonate covers protect devices such as dual action pull stations, keypads for entry systems, intercom stations, buttons, light switches, duplex plugs, etc., without restricting legitimate operation. Universal cover options for these polycarbonate covers: dome or low profile, with or without piezo horn, flush mount, surface mount or waterproof back box models. Maximum protrusion is 4 inches deep. Low profile models with a horn flash and sound when cover is lifted.