Safety Technology Magnetic Door and Window Alarm 90dB – 2 Pack, Battery Operated, On/Off Switch, Adhesive Mount, Home Security Sensor
$13.00
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These are the kind of thing you stick on a door or window and forget about — until they go off. Two magnetic sensors per unit: one on the frame, one on the door or window itself. When they separate, the alarm sounds. Simple, effective, and you don't need any tools to install them.
- 90dB magnetic sensor alarm — triggers the moment the door or window is opened
- On/off switch built in — disarm it when you want to open the window yourself
- Peel-and-stick install — adhesive backing, no screws, no drilling
- Batteries included — three LR44 button cells per unit, ready to go
- Two units per pack — cover a door and a window, or two entry points at once
Basic Door and Window Security That Actually Gets Used
The thing about most security setups is people skip them because they’re too complicated to install or too annoying to live with. These don’t have that problem. Stick one half on the frame, one half on the door, flip the switch to arm it. When someone opens that door or window without disarming it first, the alarm goes off at 90dB. Not ear-splitting, but definitely attention-getting — loud enough to startle someone and alert anyone in the house.
The on/off switch is what makes these actually livable. You can open a window on a nice day without setting off the whole neighborhood. Just flip it off, open the window, flip it back when you’re done.
Who This Door and Window Alarm Is For
Renters and apartment dwellers who can’t modify their doors or windows but still want some kind of alert if an entry point gets opened. Parents who want to know when a back door or garage door gets opened. Homeowners adding a second layer to doors that don’t have existing security.
Also works well in businesses for stockrooms, back doors, or any entrance that shouldn’t be opened without someone noticing.
Is This the Right Choice for You?
Choose this magnetic door/window alarm if you want:
- Instant alert the moment a door or window is opened — not just tampered with
- A simple on/off switch so you can open windows without disarming a system
- No-tool installation that works in rentals or temporary spaces
Consider something else if you need:
- An alarm that triggers from impact or vibration before the door is opened — look at glass break alarms
- App notifications or smart home connectivity — these are standalone, no wireless
How It Works
Each unit comes in two halves — a sensor body and a small magnet. When the two pieces are close together (door closed), nothing happens. When they separate (door opens), the circuit breaks and the 90dB siren fires. It’s a tried-and-true design that’s been used in home security for decades because it works reliably without a lot of moving parts.
Installation takes a few minutes. Peel the adhesive backing, press one piece to the door frame and the other to the door itself, aligning them so they sit close when the door is shut. Arm it with the switch. That’s it. The batteries are already inside, so you’re ready to go right out of the box.
Quick Comparison: How Does This Magnetic Door Alarm Stack Up?
| Feature | Magnetic Door Alarm (This) | Glass Break Alarm | Door Stop Alarm | Motion Sensor Alarm |
|---|---|---|---|---|
| Triggers On | Door/window opening ✓ | Glass vibration/impact | Door pressure/vibration | Movement in room |
| Works on Windows | Yes ✓ | Yes ✓ | No | Indirect |
| User Can Bypass Easily | Yes — on/off switch ✓ | Yes — switch | Yes — remove wedge | Yes — switch |
| Install Required | Peel-and-stick ✓ | Peel-and-stick ✓ | No install needed ✓ | Surface mount |
| Alarm Volume | 90dB | 100dB | Varies | Varies |
| Best For | Doors and windows both | Glass panels and windows | Hotel rooms, travel | Interior room coverage |
Practical Details
Each unit weighs 0.2 lbs and measures 2½” × 1¾” × ¾”. Power comes from three LR44/AG13 button cells per unit — included in the box. White finish, low-profile design. Two alarms per pack. Comes with a 1-year warranty from Safety Technology.
Two solid door and window alarms for not much money. Stick them up, arm them, and stop wondering whether you remembered to lock the back door.
Frequently Asked Questions
Can these be used on sliding glass doors?
Yes — sliding doors work fine with magnetic alarms. Mount one piece on the door frame and the other on the sliding panel so they align when the door is closed. When the door slides open even a few inches, the magnets separate and the alarm sounds. It’s actually one of the more useful applications for this style of alarm.
What happens if I want to open the window during the day?
That’s what the on/off switch is for. Flip it to off before you open the window, do whatever you need to do, then flip it back to on and close everything up. It’s not automatic — you have to remember to re-arm it — but it beats having an alarm that you just pull off the wall because it’s too annoying to deal with.
How loud is 90dB in practical terms?
About as loud as a lawnmower or a busy restaurant kitchen — noticeable from a fair distance and definitely startling in a quiet house at night. It’s not the loudest alarm you’ll find, but it’s enough to wake someone up and alert anyone nearby that something’s going on.
Do these work on apartment-style hollow-core doors?
Yes. The alarm doesn’t care about door material — it’s just responding to the magnet separating from the sensor body. Works on hollow-core doors, solid doors, screen doors, or windows. The only requirement is that both pieces need to be close together when the door is shut, which is easy to manage with the adjustable placement of the adhesive mounts.
| Manufacturer | Safety Technology |
|---|---|
| Decibles | 90 db |
| Battery | Three 1.5V LR44/AG13 Button Cell (Included) |
| Color | White |
| Warranty | 1 year |
| Weight | 0.2 lbs |
| Dimensions | 2 ½” x 1 ¾” x ¾” |
Additional information
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