Glass Breakage Alarm

The Glass Breakage Alarm sticks directly to any window or glass door and triggers a 100dB siren the moment the glass is hit, knocked, or broken — before an intruder has finished breaking through. The vibration sensor responds to impact on the glass surface itself, not to the window opening, which means it detects a break-in attempt at the earliest possible point. The siren sounds for approximately 30 seconds then shuts off and resets automatically. Two units included, adhesive mount, no tools required. Three AG13/LR44 batteries per unit included for both. Measures 2½" x ¾".

Window Vibration Alarm Features and Specs

• 100dB siren: Triggers on glass impact — sounds for approximately 30 seconds then resets automatically
• Glass vibration sensor: Detects hits, knocks, and breaks at the glass surface — triggers before the window fully opens or breaks through
• Two units included: Cover two windows or glass doors with one purchase
• Adhesive tape installation: Peel and stick directly to glass — no tools, no drilling, no frame mounting required
• ON/OFF switch: Disable when opening a protected window intentionally
• Indoor Use Only
• 3 AG13/LR44 batteries per unit included
• Compact size: 2½" x ¾" — unobtrusive on any glass surface

Installation takes under a minute per unit — clean the glass surface, peel the adhesive backing, press firmly onto the window, and switch on. The sensor mounts directly to the glass rather than the frame, which is what allows it to detect vibration from impact before the glass separates from the frame. The ON/OFF switch lets you open a protected window without triggering the alarm when you need ventilation — no need to remove the unit. Works on standard windows, glass doors, and sliding glass panels in homes, apartments, and RVs.

Glass Break Alarm vs Magnetic Window Sensor — Which Do You Need?

These two window security devices detect different events. The glass breakage alarm detects impact vibration on the glass — it triggers when someone hits or attempts to break the glass, before the window opens. The magnetic window and door sensors detect separation — they trigger when the window or door opens, whether by forced entry or glass removal after breaking. For complete window security, both together cover the full sequence: impact on the glass triggers the vibration alarm immediately, and any subsequent opening triggers the magnetic sensor. For buyers who only want one device, the glass breakage alarm is the earlier detection point — it responds to the attempt before entry occurs.

How sensitive is the glass breakage alarm?

The sensor is calibrated to detect the specific vibration frequency produced by impact on glass — a hit, knock, or break produces a distinctive vibration pattern that the sensor recognizes. Normal environmental vibration from traffic, wind, or nearby doors closing typically does not produce the same frequency pattern and does not trigger the alarm. The sensor mounts directly to the glass surface where impact vibration is strongest, which improves detection accuracy compared to frame-mounted sensors that pick up more ambient vibration. Testing the unit after installation by lightly knocking on the glass confirms it's armed and detecting correctly before you rely on it for overnight security.

Will this work on double-pane windows?

Yes — the adhesive sensor mounts to the inner glass surface of the window and detects vibration transmitted through the glass when the outer surface is impacted. Double-pane windows do reduce vibration transmission somewhat compared to single-pane glass, but the 100dB sensor is designed to detect impact vibration rather than subtle movement, and a forced entry attempt generates sufficient force to transmit through double-pane glass and trigger the alarm. For very thick or heavily laminated glass, post-installation testing confirms that the sensitivity is adequate for your specific window type.