STI 1155NR Stopper II with Horn and Spacer, Indoor/Outdoor Rated, No Label

Stopper II protective cover by Safety Technology International prevents false fire alarm activations while preserving legitimate use. This STI security cover combines a clear, impact‑resistant polycarbonate shell with a self‑contained audible horn (95/105 dB) so that when the cover is lifted staff and responders are immediately alerted — minimizing downtime and unnecessary dispatches. Built for both indoor and outdoor environments, the tamperproof, weatherproof housing shields pull stations from accidental bumps, vandalism and harsh conditions without obstructing normal operation.

The STI-1155NR ships with a 9V battery, mounts flush or surface for fast deployment, and is UL/cUL listed and ADA compliant for peace of mind in regulated facilities. Ideal for schools, hospitals, nursing homes, retail and commercial properties, this protective cover supports your security, fire monitoring and building safety programs by reducing false alarms and protecting critical notification devices. Add the Stopper II to your surveillance and monitoring strategy — order now or contact us for site recommendations and bulk pricing.

• Prevents costly false alarms by creating a visible, tamper‑resistant barrier that deters accidental or intentional activation
• Local audible deterrent (self‑contained 95/105 dB horn) draws immediate attention when cover is lifted, reducing response time and nuisance triggers
• Rugged polycarbonate housing is weatherproof and tamperproof for reliable indoor/outdoor protection in schools, hospitals, hotels and public buildings
• Includes 9V battery and flush/surface mount design for quick installation and continuous monitoring without wiring changes
• UL/cUL listed and ADA compliant with a 3‑year limited warranty for long‑term code confidence and reduced maintenance headaches