Original price was: $15.00.$12.75Current price is: $12.75.
I spent some time looking into window security options before I found these, and honestly the glass break alarm is one of those things I wish I’d picked up sooner. You stick it directly on the glass, and the vibration sensor does the rest — if anyone hits, cracks, or breaks that window, it fires off a 100dB siren. No wiring, no tools, no monthly fees. Two units in the pack means you can cover two windows right out of the box.
Most window security options involve either expensive professional installation or a full alarm system subscription. These glass break alarms skip all of that. You peel off the backing, press them onto the glass, switch them on, and they’re working. The vibration sensor means you don’t need a full break — impact alone is enough to trigger the alarm. That’s a meaningful difference if you’re worried about someone testing a window before committing.
The 30-second siren cycle is thoughtful design too. It’s long enough to draw attention and deter someone, but it resets on its own so you’re not dealing with a stuck alarm after a branch taps the glass during a storm.
Renters are a natural fit here — no drilling, no damage to frames, nothing that affects your security deposit. You stick them on, and when you move out, they come with you.
Homeowners who want basic coverage on basement windows, garage windows, or secondary entry points without wiring anything will appreciate how straightforward these are. They’re also useful for small businesses — a shop owner who wants an extra layer on a display window without a full monitored system gets exactly that.
If you’ve got a house with sliding glass doors or large picture windows that feel like obvious entry points, a couple of these give you coverage without a lot of effort or expense.
Choose the Glass Break Alarm if you want:
Consider something else if you need:
The vibration sensor is the key feature here. It’s mounted directly on the glass, so it picks up the physical impact of someone striking the window — not just the sound of breaking glass from across the room. That means it responds faster and more reliably than acoustic sensors that listen for the frequency of breaking glass. Once triggered, the 100dB siren sounds for approximately 30 seconds. That’s roughly the volume of a power tool or a car horn at close range — noticeable in adjacent rooms and outside the building. After the cycle completes, the alarm resets automatically. No manual reset needed.
Installation uses the included peel-off adhesive. Clean the glass surface first for best adhesion, press it on, and switch the alarm to the active mode. That’s the whole process. Button cell batteries are included, so you can have both units running the same day they arrive.
| Feature | Glass Break Alarm | Magnetic Door/Window Alarm | Motion Sensor Alarm | Window/Door Security Bar |
|---|---|---|---|---|
| Trigger Type | Vibration on glass ✓ | Separation of magnet pair | Motion in room | Physical block, no alarm |
| Installation | Peel-and-stick ✓ | Peel-and-stick ✓ | Surface mount | Wedge or bracket |
| Renter-Friendly | Yes ✓ | Yes ✓ | Yes ✓ | Yes ✓ |
| Alarm Volume | 100dB ✓ | 90dB | Varies | None |
| Auto-Reset | Yes, ~30 seconds ✓ | Manual | Varies | N/A |
| Best For | Windows, glass doors | Hinged doors and windows | Interior rooms | Sliding doors, travel |
Each unit measures 2½” x ¾” and weighs 0.2 lbs — small enough that they sit flat on glass without being obvious. Power comes from three 1.5V LR44/AG13 button cell batteries per unit, and both sets are included in the pack. The housing is white, which blends cleanly with most window frames. Two units are included per purchase. Backed by Safety Technology.
Two windows, two alarms, one straightforward purchase — peel, press, and they’re working before you’ve finished your coffee.
The sensor is calibrated for impact directly on the glass surface, so ordinary household vibrations like footsteps or nearby door closings typically won’t set it off. That said, placement matters — mounting it on a window in a very high-traffic area where the glass itself gets regularly jostled may result in occasional false triggers. For most standard residential windows, it performs reliably.
LR44/AG13 button cell batteries in standby mode typically last quite a while — often a year or more with normal use. The alarm only draws significant power during the siren cycle, which is around 30 seconds at a time. It’s worth testing the units every few months to confirm they’re still active, and replacement batteries are inexpensive and widely available.
Yes — the vibration sensor works on any glass surface, so sliding glass doors are a reasonable application. You’d mount the unit on the glass panel itself, not the frame. One consideration: if the door is opened and closed frequently with some force, you may want to test placement to find a spot that doesn’t pick up routine door movement.
No manual reset is needed. After the siren sounds for approximately 30 seconds, the alarm automatically resets to standby mode and is ready to trigger again. This is one of the more convenient features compared to some alarms that require you to switch them off and back on after each trigger.
| Manufacturer | Safety Technology |
|---|---|
| Color | White |
| Decibles | 100 db |
| Battery | Three 1.5V LR44/AG13 Button Cell (Included) |
| Weight | 0.2 lbs |
| Dimensions | 2 ½” x ¾” |
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