STI 1155 Stopper II with Horn and Spacer, Indoor/Outdoor Rated, Fire Label

Stop false fire alarms before they disrupt operations with the Safety Technology International STI 1155 Stopper II protective cover. Designed for facilities that require reliable security and monitoring—schools, hospitals, hotels and public buildings—this polycarbonate cover prevents accidental or malicious activation while allowing legitimate alarms to be triggered without restriction. When the cover is lifted, a self-contained 95/105 dB warning horn sounds locally to draw immediate attention to the area and accelerate verification and response. The outdoor-rated, impact-resistant housing withstands harsh environments and vandalism, while the included 9V battery provides dependable, low-maintenance power. UL/cUL Listing and ADA compliance ensure the Stopper II meets code and accessibility expectations for professional security and fire protection programs. Easily surface-mounted or installed with a spacer for larger pull stations, the STI-1155 integrates into existing safety, surveillance, and monitoring systems without adding complexity. Protect your facility and reduce nuisance alarms—specify the Stopper II protective cover for dependable alarm security and order or consult our sales team for installation guidance.

• Prevent costly false alarms by deterring accidental or intentional pull-station activation while preserving legitimate use
• Built-in 95/105 dB warning horn instantly draws local attention when the cover is lifted, speeding incident verification and response
• Clear, impact-resistant polycarbonate lets staff see and access the pull station without obstruction, maintaining ADA compliance
• Indoor/outdoor rated, tamper-resistant design protects equipment in schools, hospitals, hotels and other high-traffic facilities
• Self-contained battery-powered unit (includes 9V battery) with flush-mount or spacer options for flexible installation and minimal maintenance