Safety Technology Glass Break Alarm 100dB Vibration Sensor – 2 Pack, Adhesive Mount, 30-Second Auto-Reset Siren, Battery Included, Window and Door Security

SKU: ST-GLASS
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$15.00

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Picked up a couple of these after a neighbor mentioned his window got hit and nobody heard a thing. These stick right onto the glass with the included adhesive, and if anyone taps, knocks, or breaks that window, they go off at 100dB — loud enough to wake the block. They reset on their own after 30 seconds, which is handy.

  • 100dB vibration-triggered siren — fires when glass is hit, knocked, or broken
  • Auto-resets after 30 seconds — no manual reset needed after a false trigger
  • Dead-simple install — peel-and-stick adhesive, no drilling, no tools
  • Batteries included — three LR44 button cells per unit, ready out of the box
  • Two units per pack — cover two windows or a window and a door for one price

Two Little Alarms That Actually Do Their Job

These are small — barely bigger than a matchbook — but 100dB is genuinely loud. The vibration sensor picks up impact on the glass itself, so it doesn’t matter if someone’s trying to be quiet about it. Hit the window hard enough and it goes off. Simple as that. I stuck one on the sliding door in the back and one on a ground-floor window. Took maybe five minutes total.

Who This Glass Break Alarm Is For

Renters who can’t drill into walls or frames. Homeowners who want cheap, no-fuss coverage on ground-floor windows without running wires anywhere. Landlords who want to add a basic layer of security between tenants without spending much.

Also good for storage units, small businesses, or anyone with a garage or workshop window they want to monitor without setting up a full camera system.

Is This the Right Choice for You?

Choose this glass break alarm if you want:

  • Simple, renter-friendly window security with no installation hassle
  • A two-pack that covers multiple entry points for one low price
  • Something that works on windows, glass doors, or any glass surface

Consider something else if you need:

  • Smart home integration or app alerts — these are standalone, no connectivity
  • Alarm that monitors a door frame instead of the glass panel itself

How It Works

The sensor sits right on the glass. When the glass moves — from a knock, a strike, or a break — it triggers the 100dB siren. That’s loud enough to startle someone and alert anyone nearby. After about 30 seconds, it shuts off and resets automatically, so you’re not stuck chasing down a wailing alarm if a branch hits the window during a storm.

Installation is about as simple as it gets: peel the adhesive backing, stick it to the glass, slide the switch to the alarm position. Done. Batteries are already in the box, so there’s nothing to track down before you get started.

Quick Comparison: How Does This Glass Break Alarm Stack Up?

Feature Glass Break Alarm (This) Magnetic Door/Window Alarm Motion Sensor Alarm Security Camera
Triggers On Glass vibration ✓ Door/window opening Movement in room Motion (records)
Install Required Peel-and-stick ✓ Peel-and-stick ✓ Surface mount Drilling/power
Works Without Opening Yes ✓ No No No
Alarm Volume 100dB ✓ 90–120dB Varies No siren
Cost Per Unit Very low ✓ Very low ✓ Low-moderate High
Best For Ground-floor windows Doors and sliding doors Interior rooms Monitoring and evidence

Practical Details

Each unit weighs 0.2 lbs and measures 2½” × ¾” — small enough that they’re barely noticeable on a window. Power comes from three LR44/AG13 button cells per unit, and they’re included. Two alarms in the pack. White finish. No warranty listed, but for the price, getting a spare pack isn’t a bad idea anyway.

For under fifteen bucks, you get two working window alarms that install in minutes and don’t require any tools. Sometimes the simple stuff is the right stuff.

Frequently Asked Questions

Will this go off from normal vibrations like a passing truck or heavy wind?

It’s possible with very strong vibrations, but these are calibrated for impact-level contact — the kind that comes from someone striking or trying to break the glass. Normal traffic noise or wind generally won’t trigger it. If you’re in a high-vibration environment, test it before relying on it as your primary alert.

Can I use these on sliding glass doors?

Yes. As long as the sensor is mounted on the glass panel itself, it’ll pick up vibration when that panel is struck or shaken. For sliding doors, you might also want a magnetic door alarm on the frame as a second layer, since sliding doors can be lifted out of their tracks without much glass impact.

How long do the batteries last?

Button cell batteries in a passive sensor like this typically last a year or more under normal standby conditions. Since the alarm only draws significant power when triggered, you’re not draining them constantly. Worth checking every six months or so just to be sure.

Does the alarm reset on its own, or do I have to do something?

It resets automatically after about 30 seconds. You don’t have to touch it or flip a switch — it just goes quiet and arms itself again. That’s convenient if it trips during a storm or from an accidental knock and you’re not home to reset it manually.

ManufacturerSafety Technology
ColorWhite
Decibles100 db
BatteryThree 1.5V LR44/AG13 Button Cell (Included)
Weight0.2 lbs
Dimensions2 ½” x ¾”

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