This Universal Stopper® is an indoor/outdoor protective dome cover with horn and relay that helps protect devices such as pull stations and other fire safety devices 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.