Glass Break Alarm 2-Pack – 100dB Vibration Sensor

Most door-focused security overlooks one obvious entry point: the glass itself. A window can be broken or cracked without ever being opened, and a standard door or window contact alarm won’t register that. The Glass Break Alarm 2-Pack is built specifically for that gap—each unit mounts directly to the glass and responds to vibration from impact, whether the glass cracks, shatters, or takes a hard knock. Two units ship together so you can cover two windows or glass panels right out of the box.

Who This Alarm Is For

This setup works well for renters who can’t drill into walls or frames, homeowners who want to add window-specific coverage without expanding to a full system, and small business owners looking for after-hours protection on storefront or display glass. It’s also a reasonable choice for anyone with ground-floor windows, sliding glass doors, or basement windows that represent a straightforward entry point. Two packs can be combined if you need more coverage.

Is It the Right Fit for You?

Choose It If You Want

• Vibration-based detection focused on glass and window panels
• Peel-and-stick mounting with no tools or permanent hardware
• An alarm that automatically resets itself after each trigger
• Coverage for two windows in a single purchase

Consider Another Option If You Need

• Detection for doors or non-glass entry points—a magnetic contact alarm covers those better
• Remote alerts to your phone when you’re away from the property
• Coverage across a large number of windows—additional packs would be needed

Glass Break Alarm 2-Pack Features and Benefits

• Vibration sensor detection: Each unit responds to the physical impact of glass being struck or broken—not motion in the room, not air movement.
• 100dB siren: Loud enough to be heard throughout a typical home and by nearby neighbors. That’s comparable to a power drill at close range.
• Auto-reset after 30 seconds: The alarm sounds, then silences and re-arms itself automatically—no manual reset required between triggers.
• Peel-and-stick adhesive mount: Attaches directly to the glass surface. No screws, no frames, no tools. Works in rentals and leaves no permanent marks.
• On/off switch: Disarm the unit when you want to open a window without triggering the alarm. No workarounds needed for everyday use.
• Batteries included: Each unit runs on three LR44/AG13 button cell batteries, all included. Common size, easy to replace when needed.
• Two-pack coverage: Covers two separate windows or glass panels straight out of the package—no additional purchase needed to get started.

How the Glass Break Alarm 2-Pack Compares

Different alarm types detect different things. Here’s how vibration-based glass detection lines up against two common alternatives.

Feature	Glass Break Alarm 2-Pack	Magnetic Contact Alarm	Passive Motion Sensor
Detects glass impact or vibration	Yes	No	No
Detects opening of a door or window	No	Yes	No
Detects movement inside the room	No	No	Yes
Mounts to glass surface	Yes	No—mounts to frame	No—mounts to wall
Works without opening the window	Yes	No	Yes

Care and What’s Included

What’s in the Box

Each 2-pack includes two Glass Break Alarm units and six LR44/AG13 button cell batteries—three per unit—already matched to the devices. No additional hardware or adhesive strips are needed for basic installation.

Care and Maintenance

Wipe the glass surface clean before mounting to ensure the adhesive bonds properly. The units are small—2½ inches by ¾ inch—and sit flat against the glass. Replace batteries when the siren sounds weaker than normal; LR44/AG13 cells are widely available at drugstores and hardware stores.

Glass Break Alarm 2-Pack: Frequently Asked Questions

What triggers the Glass Break Alarm 2-Pack?

Each unit responds to vibration transmitted through the glass—impact from a strike, a crack, or significant force applied to the pane. It is not triggered by sound in the room or movement near the window. The sensor is mounted directly on the glass so it reads the glass itself, not the surrounding environment.

How loud is the Glass Break Alarm 2-Pack?

Each unit produces a 100dB siren when triggered. That level is comparable to a loud power tool at close range—noticeable throughout a typical home and audible to neighbors in adjacent units or nearby rooms. The alarm runs for approximately 30 seconds before silencing and automatically resetting.

Can I use the Glass Break Alarm 2-Pack on a window I open regularly?

Yes. Each unit has an on/off switch. Flip it off before opening the window and back on when the window is closed again. The auto-reset feature means you don’t need to do anything else between uses—once the switch is on, it’s armed and ready.

Does the Glass Break Alarm 2-Pack send alerts to my phone?

No. These are standalone local alarms. When triggered, they produce an audible siren at the window—there’s no app, no Wi-Fi, and no remote notification. If you need alerts when you’re away from the property, a connected security system or smart sensor would be a better fit for that use case.

Add Window Coverage to Your Security Setup

If your current setup covers doors but leaves windows unmonitored, this is a low-effort way to close that gap. Peel, stick, and the units are ready to go. Add the Glass Break Alarm 2-Pack to your cart above—or pick up more than one pack if you have additional windows to cover.