STI 1221E Stopper Dome and Strobe Damage Stopper and Open Back Box for Flush Mount

Protect your strobe and signaling devices with the STI 1221E Stopper Dome and Strobe Damage Stopper from Safety Technology International — engineered to keep alarm systems reliable in public and high‑risk environments. This protective cover, part of STI's Strobe Damage Stopper line of protective covers, uses thick, transparent polycarbonate to absorb impacts and resist UV fading while allowing full light output for effective monitoring and surveillance. The open-back box is designed for flush-mount installations (8.5 in H x 6.5 in W x 4 in D), giving technicians easy service access and simplifying wiring during maintenance.

Built to meet commercial requirements, the STI-1221E is UL/cUL listed and ADA compliant, helping you meet code and accessibility standards on deployments. Its vandal-resistant form factor reduces downtime and replacement costs in schools, transit hubs, correctional facilities, and other mission-critical security applications. Note: see installation documentation for the light derating factor.

Choose the STI 1221E to protect your monitoring infrastructure and maintain uninterrupted alarm performance. Order now or contact your Safety Technology International supplier to specify this cover for your next security or surveillance installation.

• Heavy-duty protection that prevents vandalism and accidental damage, extending the life of strobe and signaling devices
• Clear, thick polycarbonate construction preserves visibility and alarm effectiveness while resisting UV and impacts
• Open-back flush-mount design for fast installation and easy service access without removing the cover
• Code-ready: UL/cUL listed and ADA compliant to simplify approval and deployment in commercial security projects
• Low total cost of ownership with a 3-year warranty and durable, damage-resistant materials for critical monitoring sites