Sentinel wireless door and window alarm sensor
Sentinel door alarm — magnetic sensor pair shown separated

#1 Security DEVICE OF 2025

"I was always worried about our garden shed, as it's out of sight from the house. This little sensor was the perfect solution; it took literally a minute to stick on, and now I have total peace of mind knowing I'll get an instant alert on my phone if the door is ever opened."

Hannah N.

4.7 based on 10,000+ Customers

Sentinel Cameras™ Door Alarm

Instant Intrusion Alerts - Alarm goes off when activated

Effortless Wire-Free Setup - No tools or messy cables needed. The wireless, battery-powered design means you can simply peel the adhesive back and stick it in place in seconds.


No Wi-Fi or Apps Needed - Enjoy ultimate simplicity. This alarm is completely self-contained and works straight out of the box with no complicated setup, Wi-Fi passwords, or app downloads required.

Versatile & Portable Security - Perfect for more than just your front door. Use it to secure sheds, garages, caravans, or even take it with you to add extra security to a hotel room when travelling.
€17,99
€25,99
31% OFF
Quantity

Free Shipping on orders $100+

30-Day Guarantee!

1 Year Warranty 

Benefits

✔️ Instantly Deters Intruders The moment the magnetic seal is broken, a powerful, high-decibel alarm sounds immediately. This is designed to startle and scare off potential burglars before they even step inside.

✔️ No Wi-Fi or Apps Needed Enjoy ultimate simplicity. This alarm is completely self-contained and works straight out of the box with no complicated setup, Wi-Fi passwords, or app downloads required.

✔️ Effortless Peel & Stick Setup Protect any door or window in seconds. The wireless, battery-powered design requires no tools or drilling—just peel the adhesive back and stick it firmly in place.

✔️ Versatile & Portable Security Perfect for more than just your front door. Use it to secure sheds, garages, caravans, or even take it with you to add extra security to a hotel room when travelling.

How to use

Simple 3-Step Guide

Step 1: Insert The Batteries Simply slide open the back cover of the main alarm unit. Insert the required batteries (usually included) according to the +/- indicators inside the compartment and slide the cover back on.

Step 2: Peel & Stick Installation

  • Clean the Surface: Wipe the area on your door and its frame where you want to place the alarm to ensure the adhesive sticks properly.
  • Align and Stick: Peel the backing from the adhesive strips. Place the main alarm unit on the frame and the smaller magnetic strip on the door itself.
  • IMPORTANT: The two parts must be very close together (less than 1cm apart) when the door is closed. Make sure the small arrows on the side of each part are aligned and pointing at each other.

Step 3: Arming & Disarming

  • To Arm: When you want the alarm to be active (e.g., at night or when you leave the house), simply flick the switch on the side of the main unit to the ON position.
  • To Disarm: Before you open the door, flick the switch back to the OFF position. This will prevent the alarm from sounding.

If the alarm is armed and the door is opened, the high-decibel siren will sound immediately, continuing until the door is closed or the unit is switched off.

Sometimes, the Smartest Security is Simple.

Forget apps, Wi-Fi passwords, and constant updates. The Guardian Door Alarm is designed around a single belief: that powerful, reliable protection should be accessible, instant, and unfailing. Discover how its focused design provides a level of security that complex systems can't match.

Works Instantly, Every Time There is no app to download, no account to create, and no Wi-Fi to connect to. Simply insert the batteries, stick it in place, and flick the switch. Your protection is active immediately, without a single moment of setup frustration.

 

Immune to Wi-Fi & Power Cuts Smart systems fail when your internet drops or the power goes out, leaving you vulnerable. Because this alarm is completely self-contained and battery-powered, it keeps working and protecting your property no matter what, providing a layer of security you can always depend on.

 

Zero Complexity, Zero Data Worries This isn't just about saving money on subscriptions. It's about true peace of mind, knowing your security isn't reliant on a cloud service and your privacy is guaranteed. It's pure, simple, effective protection with no strings attached.

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The Simple Answer to a Sleepless Night.

Don't Just Record Your Property. Actively Guard It.

Two Way Audio

Hear and speak to anyone on your property in real-time through the app. Greet visitors, instruct couriers, or warn off intruders with a crystal-clear audio connection from anywhere in the world.

7.5W Solar Panels

The powerful 7.5W solar panel provides a strong, efficient charge to the high-capacity internal battery. This set-and-forget system ensures your camera stays powered up year-round, even through a typical winter or cloudy day.

Dual Lens

Get the best of both worlds with two cameras in one. The wide-angle lens gives you a panoramic overview of your property, while the powerful PTZ lens lets you rove around 355 degrees to capture a wide range of angles.

Family Sharing

Ensure everyone is in the loop by securely sharing camera access with trusted family members. Our app also allows you to manage up to 64 Guardian cameras, making it simple to build a complete security network for your entire property.

IP66 Weatherproof

Built to withstand the unpredictable British weather, the IP66 rating ensures your camera is completely protected against driving rain, high winds, and dust. It’s engineered for total reliability, no matter the season.

2K Colour Night Vision

See everything after dark in stunning, full-colour 2K HD. The powerful motion-activated spotlights illuminate the area, allowing you to capture vivid, sharp details instead of the blurry, useless night footage from other cameras. Optional infrared black and white vision is also available.

get 50% off & secure my home

 

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Your Questions, Answered.

Have questions? We’re here to help

Title

How loud is the alarm? Will I be able to hear it from upstairs?

The alarm features a high-decibel siren (90dB), which is extremely loud—comparable to a smoke alarm. It is designed to be startling enough to deter an intruder on the spot and is more than loud enough to be clearly heard throughout a typical British home, including from upstairs.

What type of batteries does it use and how long do they last?

The alarm uses standard AAA batteries. With typical daily use (arming and disarming once a day), a fresh set of batteries will last for 6-12 months. We recommend replacing them annually to ensure optimal performance.

What happens if I accidentally open the door when it's armed?

The alarm will sound immediately, which shows it's working perfectly! To stop it, simply close the door and flick the switch on the side of the unit to the 'OFF' position. There is no complicated process; just switch it off to instantly silence it.