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Check out our full line of products

Did you know?

We have the most complete line of pneumatic buttons in the industry.



STI Products Work!
Stopper II is a good product. We had a handicapped child who was attracted to the red manual pull stations and pulled one close to his class several times. Stopper II stopped that.

Scott Clemmer
Director of Operations
Perkiomen Valley 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

Go Smart.
Go Wireless.

Wireless Exit Stopper®
with Talking Receiver

    • Wireless multifunction door alarm alerts to
      any unauthorized exits/entries through
      emergency exit doors and rear doors
    • When sensor is activated, it sends a
      wireless signal to the talking receiver
    • Receiver offers ten tones/tunes and 53
      selectable words (in English or Spanish)
    • Has a 1000 foot range, 433MHz
    • Supervised for battery and connection

    • Prevent unauthorized use


Wireless Driveway Monitor
with Talking Receiver STI-V34150

    • Sends wireless signal to voice receiver when
      a vehicle enters or leaves the driveway
    • Quick and easy to install
    • Operates up to 1000 feet (line of sight)
    • Receiver offers 10 tones/tunes and 53
      selectable words (in English or Spanish)
    • Weather resistant, battery powered
    • Will not be triggered by animals, people
      or shadows

    • 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

Easily Connect
to Control Panel

Wireless Universal Alert with
Single Channel Slave Receiver

    • Know when a monitored site is tripped
    • Small sized receiver works in conjunction
      with a control panel
    • Has a Form “C” contact which 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