The Wireless Door Alarm That Screams When a Door or Window Opens

A burglar does not knock. This wireless magnetic door alarm does not need you to be home to catch one – the moment a protected door or window opens, a piercing 90dB siren screams out and sends any intruder running.

It fits in seconds with no wiring, no tools and no hub. If you rent, live alone, or worry about the shed and garage, this is the cheapest peace of mind you can buy.

The wireless magnetic door alarm: main unit plus separate magnet strip

Why You’ll Love It

• Magnetic sensor pair – the alarm fires the instant the magnet strip separates from the main unit, so you know the moment any door or window is opened.
• Ear-piercing 90dB siren – loud enough to startle an intruder into leaving and to alert you or a neighbour instantly.
• Stick-on install in seconds – self-adhesive pads mean no wiring, no screws and no tools. Peel, stick and it is guarding your home.
• Guards more than doors – use one on windows, sliding doors, cabinets, drawers, sheds and garage doors. Any opening can be protected.
• Tiny and discreet – the compact 9.1 x 1.9 x 3.1 cm white unit blends into any door or window frame without spoiling your decor.

Alarm unit and magnet strip: stick them on either side of the gap

Specifications

• Product: Wireless magnetic door and window alarm
• Size: 9.1 x 1.9 x 3.1 cm (main alarm unit)
• Power: 2 x AAA batteries (NOT included – sold separately)
• Alarm: 90 dB siren when the two parts separate
• Connection: Wireless standalone magnetic sensor – no hub, no app, no Wi-Fi needed
• Install: Self-adhesive mount – no wiring, no screws, no tools
• Placement: Doors, windows, sliding doors, cabinets, drawers, sheds
• What’s included: 1 x alarm unit, 1 x magnetic strip

The magnetic sensor: opening the door separates the pair and fires the siren

Built to Last: The ShopiBuy Quality Promise

We only list home security gadgets we would trust on our own doors. The sensor is a simple, proven magnetic reed design with no apps to break and no batteries to solder in.

Every order is checked before dispatch, and if anything arrives less than perfect, our UK-based support team will sort it out quickly. No fuss, no long waits.

Fits on any door frame: ideal for flats, rented homes and family houses

Frequently Asked Questions

How does a magnetic door alarm actually work?
The main alarm unit sticks to the frame and the small magnet strip sticks to the door or window edge, aligned together when closed. The moment the door or window opens and the two separate, the unit fires its 90dB siren. No wiring, no Wi-Fi hub and no app are needed.

What batteries does it use, and are batteries included?
It runs on 2 x AAA batteries, which are NOT included in the box – please have two ready when it arrives. Use fresh alkaline AAA batteries, and replace them when the siren sounds weaker than usual.

Can I use it on windows, sliding doors, cabinets and drawers as well as doors?
Yes. The magnetic sensor works on any opening where the two parts can be aligned: hinged doors, windows, sliding doors, cabinets, drawers and sheds. The peel-and-stick pads grip wood, metal, plastic and glass frames.

How do I stop the alarm once it goes off – does it reset itself?
Close the door or window again and the magnet realigns with the unit, which silences the siren. There is no remote and no app to fiddle with – opening it triggers the alarm, closing it stops it.

Everything you need in the box: alarm unit, magnet strip and retail packaging

Protect Your Home Tonight

Add the Wireless Magnetic Door and Window Alarm to your basket today. It takes seconds to fit, costs less than a pizza, and guards your doors and windows around the clock.