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This protective cover has been helping to stop false fire alarms around the world for more than 30 years without restricting legitimate alarms. All models offer excellent protection against physical damage both accidental and intentional and several against severe environments both inside and out. It is ideal for schools colleges hospitals nursing homes stores hotels and public buildings of almost every kind where there is a threat of false alarms. HOW IT WORKS Stopper II consists of a clear tamperproof tough polycarbonate shield and frame but the line includes models with the option of a piezo horn spacer Form “Cdry relay contact and gaskets. The cover accommodates most manual pull stations. When the Stopper II with horn is lifted to gain access to the protected alarm a piercing self- contained 95 or 105 dB warning horn at one foot sounds. Immediate attention is drawn to the area and a prankster will either run or be caught. The cover is connected to the frame by a cable. When the cover is lifted it drops off of the frame and a horn will sound models with horn until the cover is snapped back onto the frame or for the life of the battery.