The STI STI-1130 Stopper ll With Horn Clear Spacer Protective Polycarbonate Cover is a fire protection equipment designed to enhance safety in industrial settings. This product, made by the reputable brand STI, features a clear polycarbonate cover to protect against accidental activation of the fire alarm. The addition of a horn further increases the effectiveness of the system by sounding an alarm in the event of a fire, providing a reliable solution for facility maintenance and safety.