Magnetic Door and Window Alarm 90dB 2-Pack – Adhesive Mount Magnetic Sensor, On/Off Switch, Battery Powered, Entry Alert for Doors, Windows, and Sliding Glass Doors, Safety Technology
$13.00
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An unlocked or forced door is the most common entry point in a break-in. This 2-pack of magnetic alarms mounts with adhesive to any door or window frame and triggers a 90dB alert the moment the two sensor halves separate. There’s nothing to wire, nothing to program, and nothing to monitor — just a loud sound when something opens that shouldn’t.
- 90dB alarm triggered when magnetic sensor halves separate
- Works on doors, windows, and sliding glass doors
- Peel-and-stick adhesive installation — no tools required
- Built-in on/off switch for daily use without false alarms
- 2-pack with batteries included (three LR44/AG13 per unit), 1-year warranty
The Simplest Security: Know When Something Opens
Security doesn’t always need to be complicated. Before cameras, apps, and smart home systems, there was a basic question: did that door or window just open? A magnetic sensor answers that question with a 90dB sound that’s hard to ignore.
This 2-pack covers two entry points with straightforward magnetic separation detection. One piece goes on the frame, the other on the door or window. When they separate, the alarm sounds. When they’re back together, it stops. That’s the whole system.
Who This Door/Window Alarm Is For
Renters who can’t drill holes or install permanent hardware. Homeowners who want a low-cost first layer on secondary entry points. Parents who want to know when a child opens an exterior door. Anyone in a temporary living situation — Airbnbs, dorms, extended-stay hotels — who wants basic entry notification.
Also useful for small businesses, storage rooms, or any interior door where you want to know when someone enters.
Is This the Right Choice for You?
Choose this magnetic alarm if you want:
- Entry detection for doors and windows that open on a hinge or track
- Renter-friendly adhesive installation with no permanent changes
- A simple on/off switch for daily convenience
Consider something else if you need:
- Detection for glass being broken without the window opening (glass break alarms handle that)
- Remote alerts sent to your phone when you’re away from the location
How Magnetic Separation Detection Works
Each alarm consists of two pieces. One contains the alarm circuitry and speaker. The other is a magnet. When the two pieces are aligned — meaning the door or window is closed — the magnetic contact keeps the alarm silent. When the door or window opens, the pieces separate, the magnetic contact breaks, and the 90dB alarm sounds immediately.
Ninety decibels is roughly equivalent to a food blender or a busy city street — clearly audible throughout a house or apartment and loud enough to startle anyone who wasn’t expecting it. The built-in on/off switch is important for daily life. When you want to open your window or use the door normally, you flip the switch to off. When you’re going to sleep or leaving the house, flip it back on. No codes, no apps, no keypads. Batteries are included — three LR44/AG13 button cells per unit — and they’re inexpensive to replace when needed.
Quick Comparison: How Does a Magnetic Door Alarm Stack Up?
| Feature | Magnetic Alarm (90dB) | Glass Break Alarm | Door Stop Alarm | Smart Sensor System |
|---|---|---|---|---|
| Detects Opening | Yes ✓ | No | Physical block ✓ | Yes ✓ |
| Detects Glass Break | No | Yes ✓ | No | Varies |
| Volume | 90dB | 100dB ✓ | 120dB ✓ | Varies |
| Phone Alerts | No | No | No | Yes ✓ |
| Installation | Adhesive ✓ | Adhesive ✓ | Floor placement ✓ | Adhesive/hub |
| Best For | Doors and windows | Windows only | Doors only (travel) | Full smart home |
Practical Details
Each unit measures 2½ x 1¾ x ¾ inches. Weighs 0.2 lbs per unit. White housing. Powered by three 1.5V LR44/AG13 button cell batteries per unit (included). 90dB alarm. Built-in on/off switch. Mounts with peel-and-stick adhesive. 2-pack included. 1-year warranty. Manufactured by Safety Technology.
Basic entry detection for two doors or windows — no subscription, no app, no installation appointment. Just peel, stick, and switch on.
Frequently Asked Questions
Is 90dB loud enough to be effective?
Ninety decibels is comparable to a food blender or a lawn mower at close range. In a quiet house — especially at night — it’s immediately noticeable and will wake most people from sleep. It may not be as attention-getting to distant neighbors as a louder alarm, but for alerting people inside the home and startling an intruder at the point of entry, 90dB is effective. If you want maximum volume, glass break alarms and door stop alarms are available at 100–120dB.
Will these work on sliding glass doors?
Yes. Mount one piece on the fixed frame and the other on the sliding panel, making sure they align when the door is fully closed. When the door slides open, the pieces separate and the alarm triggers. Keep in mind that this only detects the door sliding — it won’t trigger if someone breaks the glass without opening the door. For full coverage on a sliding glass door, pairing a magnetic alarm with a glass break alarm covers both scenarios.
How often do I need to replace the batteries?
The LR44/AG13 button cell batteries last several months under normal standby conditions. The alarm only draws significant power when actively sounding. Testing the units monthly by opening the door or window with the alarm switched on is a good habit — if the sound seems weak or doesn’t trigger, replace the batteries. Replacement batteries are available at most grocery stores, pharmacies, and online retailers for very little cost.
| 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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