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You may spot a Stopper during your next vacation: St. Louis Arch, San Francisco, Antartica, Disney, etc.

Stopper II


STI Products Work!
We have installed Stopper II units over all manual pull stations in our junior high, and we have not had one false fire alarm since!

Jeff Bryan
Director of Buildings and Grounds
Red Lion Area School District

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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

Connect to
Control Panel

Wireless Driveway Monitor
with Single Channel Slave Receiver

    • Know when someone enters or leaves
      the driveway
    • Small sized receiver works in conjunction
      with a control panel
    • Receiver's Form “C” contact enables the
      device to interconnect with another system
    • Operates up to 1000’ (line of sight)
    • Form “C” relay, 12 VDC operation
    • Momentary or latching

    • More information

Covers Come
Full Circle

Single-Gang Protective Cover

    • 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

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