STI will be closed from December 24th – 26th and December 31st – January 2nd. Normal business hours will resume on January 5th, 2026.
STI Theft Stopper®
Highly effective alarm deters theft and misuse of fire extinguishers, AEDs, evacuation chairs, and more by alerting to any unauthorized use. When activated, a 95/105 siren sounds. Does not interfere with use of protected item during emergencies.
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Safety Technology International, Inc. Overview
STI manufactures high-quality protective covers, cages, alarms, and custom push buttons that safeguard essential life-safety and security devices. Trusted worldwide, STI’s innovative product line helps prevent vandalism, false alarms, and accidental damage, ensuring long-lasting protection and reliable performance for the equipment that protects people and property.
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Stopper II® with Spacer Installation
Learn how to easily install the Stopper II® with spacer, the industry’s most trusted protective cover for manual pull stations. For over 40 years, this patented design has helped prevent false fire alarms without restricting legitimate activation. Ideal for schools, hospitals, and public buildings needing reliable alarm protection.
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Steel Web Stopper® High Profile, Surface Mount (STI-9610)
The Steel Web Stopper® high-profile wire guard (STI-9610) protects smoke detectors from vandalism and accidental impact. Constructed of heavy-duty steel wire with a corrosion-resistant coating, this surface-mount design ensures reliability in high-traffic or exposed environments like warehouses, gyms, and commercial buildings.