Unique and patented device to help stop false alarms, without restricting legitimate devicesClear, tamperproof, super tough polycarbonate shield and frame that fits over manual pull stationsCover is UV-stabilized against sun deterioration and connected to frame by a cableIdeal for schools, hospitals, nursing homes, stores, hotels or any public buildingsWhen lifted to gain access to actual alarm, it sounds a piercing 95 dB or 105 dB warning horn, drawing attention to area or prankstersHorn will sound until cover is snapped back onto the frame (or for the life of the battery)