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Polycarbonate is so strong it is used for “bulletproof” windows and other applications requiring great flexibility and strength.


STI Products Work!
We’ve suggested the use of STI Stopper II units for problems with false fire alarms in schools as well as well as apartments where pull stations are located in areas with limited visibility.

Darren Drake
Fire Marshal
Napa Fire Department

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  Fire Products Theft Vandalism polycarb covers wire guards buttons switches homework products  
  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

Protection for
Mini Smoke

Steel Web Stopper®

    • Protects against vandalism and damage
    • Constructed of 9-gauge coated steel wire
    • Fast and easy installation
    • Simple removal for servicing detector
    • Three year guarantee against breakage in
      normal use

    • learn more

Chime Operates
up to 500'

New Wireless Musical Doorbell Chime

    • Wireless musical doorbell chime
    • Works up to 500 feet
    • Quick and easy to install, no wiring required
    • Ten selectable sounds
    • Can be used as a pager for a
      person requiring special care
    • UL/cUL Listed, FCC Certified

    • Find out more

Protective Cover

Mount Directly to an Electrical Box

    • Mounts directly through product mounting
      plate to an electrical box
    • Included mounting frame eliminates the need
      to drill additional holes in the wall
    • Brother to the Bopper Stopper®
    • Hinged cover takes hard knocks in stride
      while helping to protect smaller-sized
      electrical units

    • Find out more

Low Profile Cover

Universal Stopper® Low Profile

    • Indoor/outdoor low profile cover
      protects devices against damage
    • Constructed of high impact polycarbonate
    • Covers dual action pull stations, keypad for
      entry systems, intercom station, emergency
      button, wall mounted electrical box, duplex
      plug, etc.
    • High strength continuous hinge
    • ADA Compliant

    • Find out more