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

SKU: ST-GLASS
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$15.00

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Stick one on a window, flip it on, and it handles itself from there. These glass break alarms use a vibration sensor to detect when a window is hit, knocked, or broken — then fire off a 100dB siren for about 30 seconds before resetting automatically. Two units in the pack, which is enough for the most common entry points.

  • 100dB vibration-triggered siren — goes off when glass is hit, knocked, or broken
  • Auto-reset after 30 seconds — no manual reset needed after it triggers
  • Simple peel-and-stick installation — adhesive backing included, no tools, no drilling
  • Compact size — 2.5″ x 0.75″, barely noticeable on a window frame
  • Two units included — covers a front and back window, or two of your most vulnerable points

Stick It On, Turn It On, Done

There’s not a lot to explain here. You peel the backing, press the alarm onto your window, and flip the switch. If someone hits, knocks, or breaks that glass, the sensor triggers and 100 decibels goes off. That’s loud — loud enough to be heard from outside, loud enough to startle someone, loud enough that neighbors notice. It runs for about 30 seconds then resets on its own.

No wiring. No subscription. No hub. Just stick it on and walk away. For under fifteen bucks you get two of them, which is a reasonable deal for basic window coverage.

Who These Window Alarms Are For

These are a solid option for renters who can’t drill into walls, apartment dwellers, or anyone who wants basic window coverage without a big security system. They’re also useful as a supplement — even if you have a monitored alarm, having something that goes off immediately and loudly has its own value.

They work on standard windows, sliding glass doors, or any glass surface where someone could gain entry. Small businesses, storage units, vacation homes — anywhere you want a low-cost layer of protection on glass points of entry.

I’ve got a couple of these on basement windows. Not my primary security, but they’re there as a backup layer and cost almost nothing to set up.

Is This the Right Choice for You?

Choose these glass break alarms if you want:

  • Dead-simple installation with no tools — peel, stick, done
  • Coverage on windows specifically, triggered by vibration from impact or breaking glass
  • An inexpensive two-pack that covers multiple entry points

Consider something else if you need:

  • Monitoring when you’re away from home — these are local alarms only, no notifications sent to your phone
  • Door coverage — a magnetic door/window alarm is better suited for entry points that open rather than break

How It Actually Works

The sensor inside detects vibration — specifically the kind created when glass is struck or shattered. Normal household vibrations like someone walking past or closing a nearby door generally won’t set it off. It’s tuned for the sharper impact of glass being hit or broken.

When it triggers, the 100dB siren runs for approximately 30 seconds and then shuts off and resets automatically. You don’t have to go reset it manually. If the threat continues, it’ll trigger again.

Installation is just the included peel-off adhesive — mount it directly on the glass or on the frame near the glass. The unit is small enough (2.5″ x 0.75″) that it doesn’t look obtrusive. Runs on three LR44/AG13 button cell batteries that come included in the pack.

Quick Comparison: How Do These Glass Break Alarms Stack Up?

Feature Glass Break Alarm Magnetic Door/Window Alarm Motion Sensor Alarm Security Camera
Detects glass impact / breaking Yes ✓ No Sometimes No — records only
No installation tools needed Yes ✓ Yes ✓ Varies Usually requires mounting
Immediate loud alert on-site Yes ✓ Yes ✓ Yes ✓ No
Works on closed windows Yes ✓ No — only when opened No No
Remote notification No No Some models Yes ✓
Best For Window break detection Door/window opening detection Indoor room coverage Recording and remote monitoring

Practical Details

Dimensions: 2.5″ x 0.75″. Weight: 0.2 lbs per unit. Siren: 100dB, runs approximately 30 seconds then auto-resets. Power: Three 1.5V LR44/AG13 button cell batteries — included in the pack. Installation: Peel-off adhesive backing, no tools required. Quantity: 2 units per pack. Manufactured by Safety Technology.

Two glass break alarms for under fifteen bucks, batteries included, and you’re up and running in five minutes — hard to argue with that for basic window coverage.

Frequently Asked Questions

Will normal household vibrations set these off accidentally?

The vibration sensor is calibrated for the sharper impact of glass being struck or broken, not the milder vibration of someone walking by or a door closing down the hall. That said, very heavy impacts nearby — a door slamming hard right next to the window, for example — could potentially trigger it. Most users find false alarms rare under normal household conditions.

Do I mount these on the glass itself or on the frame?

Either works, but mounting directly on the glass surface gives the sensor the most direct contact with vibrations from an impact. The frame is a second option if you prefer the unit to be less visible. Use the included peel-off adhesive — no drilling or additional hardware needed.

How long do the batteries last?

LR44/AG13 button cells in standby mode last a long time — most users go a year or more before needing to replace them. Since these aren’t constantly drawing power, the battery drain is minimal until the alarm actually triggers. The batteries come included so you’re ready to go right out of the box.

Can these be used on sliding glass doors?

Yes. Any glass surface works — standard windows, sliding glass doors, glass panels beside entry doors. Mount it on the glass itself for best sensitivity to vibration. If you’re covering a sliding glass door that you also open regularly, you’ll want to remember to switch the alarm off before opening it, since the movement could create enough vibration to trigger the sensor.

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

Additional information

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