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Stopper II has been helping stop false fire alarms for over 30 years.

Stopper II


STI Products Work!
I recently purchased an STI cover for one of our thermostats. It was constantly being adjusted by teenagers coming into our building after school. The problem is now solved!

Lisa Bauer
Facility Manager
Brandon Township Public Library

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About STI

False fire alarms and the theft and vandalism of protection devices can be a serious issue, compromising safety as well as costing money.

STI has been producing safety technologies that stop false fire alarms and prevent theft and vandalism for thirty years. We now market more than 1000 products worldwide. Our range includes fire alarms protection devices, stopper covers and enclosures, wire guard protectors and security protection products.

Contact us now to discuss how we can solve your specific problems.

STI Stopper II

Big Choices,
Small Package

Over 300 Combinations
in One Package

    • Momentary push button
    • Over 300 combinations, one convenient
    • Helps eliminate the need to stock dozens
      of push buttons
    • Faceplate constructed of cast aluminum
    • Two sets of Form "C" contacts
    • UL/cUL Listed

    • Save time and money

Help Reduce

Wire Guard Protection

    • Protect vulnerable devices against
      vandalism, accidental damage and theft
    • Constructed of tough 9-gauge steel wire
      coated with corrosion resistant polyester
      or stainless steel
    • Protects beam smoke guards, smoke or
      motion detectors, speakers/strobes,
      lights, exit signs, clocks/bells, etc.
    • Many models UL Listed

    • Find out more

2014 Money-Saving
Products Winner

Fire Extinguisher Theft Stopper®

    • Voted as Buildings magazine's
      Money-Saving Product
    • Helps stop theft, vandalism or misuse
      of fire extinguishers
    • Does not interfere with legitimate usage
    • Alerts 95/105 dB alarm if moved from
      normal position
    • Easy to install, mounts next to extinguisher
    • Wireless models available

    • Find out more

Low Profile Cover
with Enclosed
Back Box

Universal Stopper®

    • Indoor/outdoor cover has a flat profile,
      enclosed back box and open mounting plate
    • Protects a wide range of devices
    • Constructed of tough polycarbonate
    • High strength continuous hinge
    • Low Profile - ADA Compliant

    • Find out more