Polycarbonate cover with horn and clear spacer that helps protect pull stations from false fire alarms. Ideal for commercial, educational, medical and public buildings. This cover is ideal for commercial, educational, medical and public buildings. When this Stopper II model 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 the individual that lifted the cover will either run or be caught. Fire label provided on hood. This protective cover has been helping to stop false fire alarms around the world for more than 40 years, without restricting legitimate alarms. UL/cUL Listed, ADA Compliant.