Safety Technology Glass Break Alarm 100dB – Vibration Sensor, 30-Second Siren, Adhesive Mount, 2 Pack, Battery Included, 2.5″ x 0.75″

SKU: ST-GLASS
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$15.00

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A glass break alarm works on a simple principle: the moment someone strikes or shatters a window, the vibration sensor triggers immediately — before an intruder has time to climb through. These units mount directly to the glass surface with peel-and-stick adhesive, require no wiring, and include batteries. Two are included in this pack.

  • 100dB vibration-triggered siren activates when glass is struck, knocked, or broken
  • Siren runs for 30 seconds then automatically shuts off and resets — no manual reset needed
  • Adhesive backing installs in under a minute, no tools or drilling required
  • Batteries included: three 1.5V LR44/AG13 button cells per unit
  • Compact profile at 2.5″ x 0.75″ — unobtrusive on any window

Window Security That Installs in Under a Minute

Most window alarms detect when a window opens. Glass break alarms detect the impact itself — which means coverage starts at the moment of attempted entry, not after a pane is already out of the frame. At 100dB, the siren is loud enough to alert occupants in adjacent rooms and draw attention from outside. The 30-second auto-reset means no one has to manually silence or restart the unit after a trigger.

Installation requires nothing beyond peeling the adhesive backing and pressing the unit against the glass. No screws, no drilling, no wiring.

Who This Glass Break Alarm Is For

Homeowners who want a first line of defense on ground-floor windows without investing in a monitored system. Renters who can’t drill into walls or window frames but still want functional coverage. Small business owners who need affordable overnight protection for storefront glass.

The two-pack makes practical sense for a home: one on a sliding door panel, one on a bedroom or living room window. Or one at each end of a multi-pane window wall. The compact size keeps them visually unobtrusive even in finished spaces.

Is This the Right Choice for You?

Choose the Glass Break Alarm 2 Pack if you want:

  • Immediate vibration-based detection at the point of impact — not just when a window opens
  • No-tool installation with included adhesive and batteries
  • Two units for multi-window or multi-room coverage at a low per-unit cost

Consider something else if you need:

  • Door-opening detection — a magnetic door/window alarm is better suited for that
  • Connectivity to a smart home or monitored security system

How the Vibration Sensor Works

The alarm contains a piezoelectric vibration sensor calibrated to detect the impact signature of glass being struck or broken. When that threshold is crossed — a knock, a strike, or a full break — the sensor fires and the siren activates within a fraction of a second. The 100dB output is equivalent to a chainsaw at close range, loud enough to be heard clearly from outside the building.

After 30 seconds, the unit silences and resets automatically. There’s no need to enter a code, press a button, or do anything to restore coverage. If the threat continues, the sensor will trigger again.

The button cell batteries that power the unit are included and pre-installed. Replacement cells (LR44/AG13) are available at any hardware or pharmacy.

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

Feature Glass Break Alarm Magnetic Door/Window Alarm Motion Sensor Security Camera
Detects impact before entry Yes ✓ No — detects opening only No — detects movement inside No — records after the fact
No tools to install Yes ✓ Yes ✓ Varies Usually requires mounting
Works on glass surfaces directly Yes ✓ Requires frame/edge No No
Audible deterrent 100dB ✓ 85–120dB ✓ Varies Rarely
Auto-reset after trigger Yes ✓ Varies Varies N/A
Best For Windows, glass doors, storefronts Hinged doors, casement windows Interior rooms, hallways Visual documentation, deterrence

Practical Details

Each unit measures 2.5″ x 0.75″ and weighs 0.2 lbs. Three 1.5V LR44/AG13 button cell batteries are included per alarm. Installation uses peel-off adhesive — mount directly to the glass surface, switch to alarm mode, done. Two units per pack. Manufactured by Safety Technology.

Two windows covered, batteries included, no tools required — effective glass protection that takes less than two minutes to deploy.

Frequently Asked Questions

Will the alarm trigger from normal vibrations like trucks driving by or strong wind?

The vibration sensor is calibrated for impact-level thresholds consistent with glass being struck or broken. Normal ambient vibrations — traffic, wind, footsteps — are generally below the trigger threshold. However, very heavy truck traffic close to the window or significant structural vibrations (like a nearby construction site) could occasionally trigger the sensor. Placement on thicker glass or away from high-vibration areas will minimize false triggers.

Can these be mounted on sliding glass doors?

Yes. The adhesive mount works on flat glass surfaces including sliding door panels. For sliding door coverage, consider pairing a glass break alarm on the door panel with a magnetic door alarm on the track for two-layer protection — the glass break alarm detects impact, and the magnetic alarm detects if the door is opened.

How long do the batteries last?

LR44/AG13 button cells in a low-draw standby device like this typically last 12–18 months under normal conditions. Battery life depends on how frequently the alarm triggers and storage temperature. Replacement cells are widely available at hardware stores, pharmacies, and online retailers for under $5 for a pack.

Does the alarm reset itself, or do I need to do something after it goes off?

The alarm automatically silences and resets after 30 seconds. No manual intervention is required to restore it to active standby. If the triggering vibration is still present (an ongoing break-in attempt, for example), it will trigger again once reset.

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

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