Description
A two-piece magnetic contact alarm for doors and windows: mount one half on the frame, the other on the door or window, and a 90dB siren sounds the moment they separate. The built-in on/off switch lets you open the window yourself without triggering it. Sold as a 2-pack.
Entry Detection That Installs in Under Two Minutes
A door or window alarm doesn’t need to be complicated to do its job. The magnetic principle is straightforward: two halves stay close together and the alarm stays quiet. The moment they separate — because a door or window is being opened — the circuit breaks and the siren sounds. This magnetic alarm handles that reliably, adds a manual on/off switch for your own use, and needs nothing more than peeling off an adhesive backing to install.
That simplicity is the point. There’s no wiring, no hub, no app, and no subscription. You stick both halves in place, flip the switch on, and the entry point is covered.
Who This Door and Window Alarm Is For
Renters and apartment dwellers who want entry detection without drilling, patching, or risking a security deposit will find that peel-and-stick installation removes every excuse to put it off. Parents who want to know when a door or window is opened — by a young child or an unwanted visitor — get a direct, audible alert right at the point of entry, with no monitoring subscription. Homeowners adding basic coverage to secondary entry points like basement windows, garage doors, or back doors get an affordable option that deploys quickly and needs no wiring or technical setup.
It’s also a natural fit for sliding glass doors and windows you actually open during the day, thanks to the manual switch.
Is This the Right Choice for You?
Choose the Magnetic Door/Window Alarm if you want:
- An immediate audible alert when a door or window is opened without authorization
- Dead-simple peel-and-stick installation with no tools or technical knowledge
- A manual on/off switch so you can open windows yourself without triggering the alarm
- An affordable two-pack to cover multiple entry points in one purchase
- A renter-friendly option with no drilling and no damage
Consider something else if you need:
- Detection of glass breaking without the window being opened — a glass break vibration alarm covers that
- Interior room coverage after entry — a motion sensor or barking dog alarm is better suited
How It Works and Why It Holds Up
The alarm consists of two pieces. The larger piece — holding the alarm circuit and battery — mounts to the door or window frame. The smaller magnetic piece mounts to the door or window itself. With the door closed, the two sit side by side and the magnetic connection keeps the circuit intact. The moment they separate, the 90dB siren activates. It continues sounding as long as the pieces are apart; close the door or window and it stops immediately.
The on/off switch is a genuinely practical addition. It makes this alarm livable on a window or door you open routinely — switch it off before opening, back on when you close it. It’s a small detail that’s the difference between a security tool you use consistently and one you disable for good because it’s inconvenient.
At 90dB, the alarm sits in the range of a lawn mower or a passing motorcycle at close range — clearly audible through walls and across most residential spaces. Each unit measures 2½″ x 1¾″ x ¾″ and weighs just 0.2 lbs, and the three LR44/AG13 batteries that power each unit are included, so you can install both alarms immediately without a separate battery run.
Quick Comparison: How Does the Magnetic Door and Window Alarm 90dB (2-Pack) Stack Up?
| Feature | This Magnetic Alarm (2-Pack) | Glass Break Alarm | Motion Sensor Alarm |
|---|---|---|---|
| Triggers on | Door/window opening (magnet separation) | Glass breaking vibration | Movement in a room |
| Sound output | 90dB | Varies | Varies |
| Installation | Peel-and-stick | Peel-and-stick | Mount/place |
| On/off switch | Yes | Often | Yes |
| Units included | 2 | 1 | 1 |
| Batteries included | Yes (per unit) | Varies | Varies |
Practical Details
Each alarm measures 2½″ x 1¾″ x ¾″ and weighs 0.2 lbs. It runs on three 1.5V LR44/AG13 button cell batteries (included in each unit). Alarm output is 90 decibels. There’s a built-in on/off switch, peel-and-stick adhesive is included, and the color is white. Two alarms come per pack. Backed by our standard product warranty, and you can reach our support team at [email protected].
Two entry points, two alarms, batteries in the box — you can have both units installed and armed in the time it takes to read this page.
Frequently Asked Questions
How far apart can the two magnetic pieces be before the alarm triggers?
The sensor triggers when the two pieces separate beyond a very small gap — typically within a fraction of an inch. That means the alarm fires at the very beginning of the door or window opening, not after it’s partly open. For reliable function, mount both pieces close together when the door or window is closed — ideally with the faces nearly touching or within about an eighth of an inch.
Can I use this on a sliding glass door?
Yes. Sliding glass doors are one of the most common applications for this type of alarm. Mount the alarm body to the frame and the magnetic piece to the door, positioning them so they align when the door is fully closed. The on/off switch is especially handy here, since sliding doors are often opened deliberately during the day — switch it off when you use the door and back on when you close up for the night.
Does the alarm stay on continuously after triggering, or does it stop on its own?
It keeps sounding as long as the magnetic pieces remain separated. Close the door or window — returning the halves to proximity — and the alarm stops. So if you trigger it by accident, simply closing the door ends the alarm without touching the unit.
How long will the batteries last?
LR44/AG13 button cells have good standby longevity — in a sensor that’s armed but not actively alarming, expect a year or more under typical conditions. Frequent triggering drains them faster, but for a standard residential installation, annual replacement is a reasonable schedule. Replacements are inexpensive and available at most hardware stores, pharmacies, and online.
Is a warranty included?
Yes — this alarm is backed by our standard product warranty. If you have any questions, you can reach our support team at [email protected].
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