STI 1100 Stopper II with Horn – Flush Mount Protective Polycarbonate Cover

Overview

The STI 1100 Stopper II with horn offers a smart, tamper-resistant solution to reduce false fire alarm activations while preserving access for legitimate alarms. Designed for high-traffic environments like schools, hospitals, nursing homes, stores, hotels, and public buildings, this flush-mount device blends sturdy protection with easy daily use.

How it works

A protective polycarbonate cover shields the alarm from accidental triggers. The cover is connected to the frame by a cable so it dangles when opened. The self-contained horn provides 95 dB or 105 dB of audible warning, signaling when access is gained and ensuring responders know when to check the system. Once the cover is snapped back onto the frame, the horn stops blaring, returning the system to a quiet state until the next access.

Durability and safety you can rely on

The polycarbonate cover is engineered for long life, backed by a 3-year guarantee against breakage in normal use, with 1 year on electronics. The device is UL Listed to U.S. and Canadian safety standards and comes with a ready-to-test battery. The enclosure is rated for wide temperature ranges, from -40°F to 120°F (-40°C to 49°C), supporting installation in diverse indoor environments.

Key benefits

• Protective, tamper-resistant cover reduces nuisance alarms without hindering legitimate access
• Clear polycarbonate shell provides strong durability while remaining lightweight
• Self-contained 95 dB or 105 dB horn delivers audible alert when opened
• Cover remains attached to the frame by a cable, ensuring controlled access and reset
• UL Listed for U.S. and Canadian safety standards

What to expect in daily use

Ideal for settings where alarms must be accessible yet protected, the Stopper II helps manage alarm visibility and response. The system ships with a battery included, ready for routine verification and maintenance. The design prioritizes clear cues for staff and responders while maintaining a discreet, low-profile profile when closed.

Maintenance and care

• End users should verify the alarm and battery function every six months
• Replace the battery annually or as required by your maintenance schedule
• Three-year polycarbonate cover guarantee; one-year electronics warranty

Recommended environments

From classrooms and cafeterias to patient wings and retail floors, the Stopper II supports safe, compliant operation in spaces that require reliable access control without compromising fire safety signaling.