This unique and patented device has been helping stop false fire alarms around the world for more than 20 years, without restricting legitimate alarms. Mini Weather Stopper is a protective cover for surface mount units flush - see STI-6525. It consists of a clear polycarbonate shield, weather gaskets, frame and conduit spacer. Cover contains no horn. Additional models are available with a built-in warning horn that sounds when the cover is lifted to gain access to the pull station see STI-6605.