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Magnetic Door and Window Alarm 90dB 2-Pack — Peel-and-Stick Sensor, On/Off Switch, Battery Powered Entry Alert for Doors, Windows & Sliding Glass, White

SKU: ST-SLAW
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Original price was: $13.00.Current price is: $11.05.

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You don't need an expensive security system to know when a door or window gets opened. These magnetic alarms work on a simple principle — when the two halves of the sensor separate, the 90dB siren goes off. Install them in minutes, and you've got reliable entry detection on any door, window, or sliding glass panel in your home.

  • 90dB alarm triggers instantly when magnetic sensor halves separate
  • Peel-and-stick adhesive installation — no tools or wiring
  • Built-in on/off switch for daily use without hassle
  • Two units included for covering multiple entry points
  • 1-year warranty from Safety Technology

Know the Moment a Door or Window Opens

From what I’ve seen, the best security starts with the basics — knowing when someone enters your space. These magnetic alarms give you exactly that. One piece goes on the frame, the other goes on the door or window. When they separate, the siren sounds. No apps, no Wi-Fi, no subscription. Just reliable detection that works every time.

At 90dB, the alarm is loud enough to wake you up and startle anyone who wasn’t expecting it. That moment of surprise is often enough to make an intruder rethink their plan.

Who This Alarm Is For

Parents who want to know when kids open exterior doors. Homeowners who want basic entry alerts without the cost of a full security system. Renters who need something they can install and remove without leaving marks or drilling holes.

Small business owners put these on back doors and storage rooms. Anyone with a sliding glass door or basement entry can add an alarm in under two minutes. The on/off switch means you can disable it when you’re coming and going during the day and arm it at night.

Is This the Right Choice for You?

Choose this Magnetic Door/Window Alarm if you want:

  • Simple entry detection on any door, window, or sliding panel
  • Easy daily use with a built-in on/off switch
  • Budget-friendly security with no monthly fees

Consider something else if you need:

  • Louder siren above 100dB for larger spaces
  • Remote notifications or smartphone alerts

Basic Security Done Right

The magnetic sensor system is straightforward and proven. Attach the larger piece to the door or window frame, and the smaller magnetic piece to the moving surface — the door or window itself. When they’re together, the alarm stays silent. When they separate, the 90dB siren kicks in immediately.

The built-in on/off switch is what makes these practical for daily life. You don’t want an alarm screaming every time you open your own back door. Flip it on when you leave or before bed, and flip it off when you’re actively using that entry. The compact white design at 2.5″ x 1.75″ x 0.75″ fits any frame without being an eyesore, and the LR44 batteries are included right in the package.

Quick Comparison: How Does a Magnetic Door Alarm Stack Up?

Feature Magnetic Door/Window Alarm Glass Break Alarm Motion Sensor Security Camera
Detection Type Door/window opening ✔ Glass impact Movement Visual recording
Audible Alert 90dB 100dB ✔ Varies Some models
On/Off Switch Yes ✔ Yes ✔ Varies App-based
Installation Peel-and-stick ✔ Peel-and-stick ✔ Mount/plug-in Mount + setup
Monthly Fees None ✔ None ✔ Some models Often required
Best For Entry detection on doors/windows Glass protection Room coverage Evidence collection

Practical Details

Each unit measures 2.5″ x 1.75″ x 0.75″ and weighs 0.2 lbs. White finish matches standard door and window frames. Powered by three LR44/AG13 button cell batteries (included). Built-in on/off switch. Two units per package. 1-year warranty from Safety Technology.

Simple entry detection that works when you need it. No subscription, no hassle — just real security.

Frequently Asked Questions

Can I use this on a sliding glass door?

Yes. Place one sensor half on the fixed frame and the other on the sliding panel. When the door slides open, the magnets separate and the alarm sounds. It works the same way on any door or window where the two surfaces move apart from each other.

How far apart do the sensors need to be before the alarm triggers?

The alarm triggers once the magnetic pieces separate by roughly half an inch to an inch. That means even a slight opening of a door or window is enough to set it off. This sensitivity ensures you’re alerted before someone fully enters your space.

Will the adhesive damage my door frame or window?

The peel-and-stick adhesive is designed to hold securely while in place but can be removed without significant damage. Renters and apartment dwellers commonly use these without issues. If any residue remains, standard adhesive remover takes care of it easily.

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”

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