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

Stopper II


STI Products Work!
Our problems came to a halt after installation of your Stopper IIs.

Rudy  Ramirez
Indio High School

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  Fire Products Alarms & Chimes Polycarbonate Covers Wire Guards Buttons and Switches Home & Work Products  

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

Keep It Hot

Multiple Heated Enclosures

    • Offers an excellent way to secure electronics
      outside or in exposed environments
    • Radiant heat plate prevents controls from
      becoming sluggish or inoperable
    • Heater keeps temperatures above 32
      degrees inside covers
    • Multiple sizes available
    • For use over controls, pull stations, keypads,
      horn/strobes and more

    • Find out more

Conduit Exposed?
STI’s Solution.

Universal Stopper ®

    • Indoor/outdoor polycarbonate cover
    • Protects against vandalism and damage
    • Sized to fit most pull stations
    • Cover molded from thick, super tough
      polycarbonate material
    • High strength continuous hinge
    • Low profile, ADA Compliant

    • Find out more

Watchdog Alarm

Rex Plus® II Watchdog Alarm

    • Barking dog alarm
    • Provides an excellent way to deter burglars
    • The closer an intruder gets, the more
      frequent the barking becomes
    • Controls at the top for easy access
    • Simply plug into standard electrical outlet
      or uses 6 C batteries
    • Water resistant flip top

    • Find out more

Chimes Operate
Up to 500 Feet

New Wireless Chimes
STI-3350 & STI-3360

    • Commercial grade wireless musical
      chimes with receiver
    • Exceptional operating range – up to
      500 feet
    • Quick and easy to install
    • No electrical wiring required and no
      expensive through-the-wall drilling
    • Ten selectable sounds
    • UL/cUL Listed, FCC Certified

    • Find out more