This unique Stopper II® protective cover has helped prevent false fire alarms around the world for more than 35 years, without restricting legitimate operation of devices.
Stopper II® Replacing Horn Battery
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Safety Technology International, Inc. Overview
STI manufacturers covers, cages, alarms and custom buttons. Rely on STI® to protect the things that protect you.
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Stopper II® with Spacer Installation
How to easily install the Stopper II® with spacer. This unique Stopper II protective cover has helped prevent false fire alarms around the world for over 40 years, without restricting legitimate operation of devices.
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Steel Web Stopper® High Profile, Surface Mount (STI-9610)
Constructed of tough 9-gauge coated steel wire, this cage is an excellent way to protect smoke detectors against both vandalism and accidental damage.