Safety Technology Magnetic Door and Window Alarm 90dB – 2 Pack, Adhesive Mount, On/Off Switch, LR44 Batteries Included, 1-Year Warranty, DIY Home Security

SKU: ST-SLAW
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$13.00

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Two magnetic door and window alarms, simple peel-and-stick install, batteries included. One side goes on the frame, the other on the door or window — when they separate, the alarm goes off. The built-in on/off switch means you can open the window yourself without triggering it. Nothing complicated.

  • 90dB magnetic sensor alarm — triggers when door or window is opened without switching off first
  • Built-in on/off switch — lets you open the door or window normally without setting it off
  • Peel-and-stick adhesive mounting — no tools, no screws, no drilling
  • Compact at 2.5″ x 1.75″ x 0.75″ — low profile on any door or window frame
  • 2 units per pack with batteries included and 1-year warranty from Safety Technology

Two Sensors, Five Minutes, Done

The concept is straightforward. You stick one half of the sensor on the door or window frame, and the other half on the door or window itself. As long as the two magnetic halves are close together, it’s quiet. The moment they separate — because someone opened it — the 90dB alarm goes off. That’s it.

The on/off switch is the part that makes this actually usable day-to-day. You’re not locked into leaving every window sealed shut just because the alarm is on. Flip the switch when you want to open it yourself, done.

Who These Door and Window Alarms Are For

Renters are probably the best fit — no damage to walls or frames, easy to take with you when you move. Same goes for dorm rooms, which often have ground-floor windows that deserve a little attention. They also make sense for vacation homes or Airbnb properties where you want basic coverage without a full system.

Two units gives you enough for the most common entry points — front door and a first-floor window, for example, or two windows on the same side of the house. If you need more coverage, they’re inexpensive enough to buy additional packs without much thought.

Is This the Right Choice for You?

Choose these door and window alarms if you want:

  • Fast, no-tools installation you can do in minutes — peel, stick, switch on
  • Coverage on doors and openable windows that trigger when someone opens them
  • A practical two-pack at a low price point with batteries already included

Consider something else if you need:

  • Detection for windows that are broken rather than opened — a glass break alarm handles that scenario better
  • Remote alerts when you’re not home — these are local-only alarms with no connectivity

How It Actually Works

Magnetic contact alarms work on proximity. The two-piece sensor stays silent when its halves are within range of each other. Separate them — by opening the door or window — and the circuit breaks, triggering the alarm. It’s a reliable, simple mechanism with nothing complex to go wrong.

At 90dB, it’s loud enough to be heard throughout a typical home and attention-grabbing enough to startle anyone on the other side of the door. The on/off switch gives you manual control when you need it — so you can open the window on a nice day without the alarm going off on your own household.

Installation takes a few minutes. Peel the adhesive backing, press one half to the door or window frame, the other half to the door or window surface itself, align them so they sit close together when closed, and switch on. The units are compact — 2.5″ x 1.75″ x 0.75″ — and don’t look intrusive on a standard door or window frame.

Quick Comparison: How Do These Magnetic Alarms Stack Up?

Feature Magnetic Door/Window Alarm Glass Break Alarm Door Stop Alarm Security Camera
Detects door/window being opened Yes ✓ No Yes — blocks + alerts ✓ No — records only
No tools required Yes ✓ Yes ✓ Yes ✓ Usually requires mounting
Works on standard doors Yes ✓ No Yes ✓ Yes
Physical barrier included No No Yes ✓ No
On/off switch for daily use Yes ✓ No Yes App-controlled
Best For Doors and openable windows at home Window break detection Hotel rooms, travel, dorm doors Recording and remote monitoring

Practical Details

Dimensions: 2.5″ x 1.75″ x 0.75″. Weight: 0.2 lbs per unit. Siren: 90dB. Power: Three 1.5V LR44/AG13 button cell batteries — included. Installation: Peel-off adhesive, no tools required. Quantity: 2 units per pack. Warranty: 1 year from Safety Technology.

Basic, reliable door and window coverage at a price where buying two or three packs to cover your whole home still doesn’t break the bank.

Frequently Asked Questions

Can these be used on sliding glass doors?

Yes. As long as you can mount both halves of the sensor so they’re close together when the door is closed and separate when it opens, it’ll work. On a sliding glass door, one half goes on the door frame and the other on the door panel itself near the frame edge. Just make sure both halves align properly when the door is in the closed position.

Does the alarm keep going until I manually turn it off?

The alarm will continue sounding as long as the two magnetic halves remain separated — meaning as long as the door or window is open. When the door or window closes again and the magnets realign, the alarm stops. You can also use the on/off switch to silence it manually. There’s no auto-reset timer like some glass break alarms have.

Will the adhesive damage my door or window frame?

The included adhesive is designed for standard surfaces — painted wood, metal, vinyl — and doesn’t typically leave damage when removed carefully. On delicate or freshly painted surfaces, it’s worth testing a small area first. For extra caution, some people use removable mounting tape as an alternative to the included adhesive.

How far apart can the two halves be before the alarm triggers?

Magnetic contact alarms trigger when the gap between the two halves exceeds a small threshold — usually around a quarter to half an inch of separation. This means even a slightly opened door or window will set it off, which is actually what you want. It catches the entry attempt very early rather than waiting until the door is fully open.

ManufacturerSafety Technology
Decibles90 db
BatteryThree 1.5V LR44/AG13 Button Cell (Included)
ColorWhite
Warranty1 year
Weight0.2 lbs
Dimensions2 ½” x 1 ¾” x ¾”

Additional information

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