This Universal Stopper® is an indoor/outdoor protective dome cover with horn and relay that helps protect devices such as pull stations, keypads for entry systems, intercom stations, emergency buttons, electrical light switches, duplex plugs, etc., without restricting legitimate operation. This surface mounted cover with enclosed back box and open mounting plate offers excellent protection against physical damage (both accidental and intentional), dust and grime as well as severe environments inside and out. Molded of clear, thick, UV-stabilized polycarbonate material, the cover is backed by a three year guarantee against breakage in normal use.