STI 1150 Stopper II with Horn Flush Mount, Indoor/Outdoor Rated, Fire Label

Protect critical fire alarm pull stations and reduce unnecessary downtime with the STI 1150 Stopper II from Safety Technology International. This proven protective cover stops false alarms and nuisance activations while leaving legitimate alarms fully accessible — the clear polycarbonate shield provides visible protection without obstructing use. When the cover is lifted, a self-contained 105 dB warning horn sounds to immediately draw attention and deter tampering, helping security and facilities teams respond faster and reduce needless service calls.

Built for demanding environments, the Stopper II is indoor/outdoor rated with an IP54 rating for dust and splash resistance and installs as a flush-mount to preserve building aesthetics and ADA compliance. The unit ships with a 9V battery and meets UL/cUL standards, making it simple to add to existing fire protection, monitoring, and surveillance programs. Ideal for schools, hospitals, hotels, and commercial buildings, the STI 1150 integrates seamlessly into broader security strategies to lower false alarm frequency and protect occupants.

Order the STI 1150 Stopper II today to strengthen your fire alarm protection and improve overall security monitoring.

• Prevents costly false fire alarms and nuisance dispatches while allowing legitimate alarm activation
• Loud 105 dB self-contained horn instantly draws attention when cover is lifted, deterring tampering
• Durable, clear polycarbonate shield resists vandalism and harsh environments (IP54 indoor/outdoor rated)
• Flush-mount design fits most pull stations and stays ADA compliant without impeding use
• Easy maintenance with included 9V battery and UL/cUL listing for code-compliant installations