Defender Ultra Slim Window Alarm 2 Pack, 130dB Vibration Sensor, Glass Break & Window Smash Detection, Loud Security Siren, Police Accredited, Gold Sold Secure

Good product. Does what it says.quite loud. And very east to install and use.

Great price. Makes a very good loud alarm if activated. Have placed on all windows.

Goes off by itself

I only got it today and stuck them on the bottom right of the downstairs window glass and gave it a few knocks and boom, the alarms went off. Imagine how quickly it would go if a hard object were to hit the glass! So far, so good. And I like how it has the warning sticker to alert intruders. Great product and easy to use, not to mention the slim design and great adhesive. Not expensive and well packaged. Sensitivity is great as the goal is to be alerted for break in or broken glass, not tapping on the glass.

I put one on the window next to my door. I first tried opening and closing the door, as when I do this a vibration goes through the glass window. Nothing happened. I slammed the door, still nothing. I banged on the window, then banged next to the alarm, still nothing. I tried the second alarm, same result. I tried with both of them on the window, still nothing. I gave up. The only time the alarm went off was when I had peeled one of them halfway off the window and even then I wasn't impressed with the noise level of the alarm. If I could give no stars I would. Don't waste your money.

Compact, warning stickers are not stuck aligned so look rubbish from outside. They work but I would like if they were more sensitive so alarm triggers sooner

They easily stick onto glass windows and doors. They have a loud siren but we’ve only tested them, thankfully not had them put to use. They are just another deterrent which create a lot of noise but were recommended by our local neighbour hood watch team.

Purchased for front/ back door alarm protection after attempted kicking/ break in whilst asleep at night. Excellent value, quality, noise level, functionality & easy to install, much smaller than I was expecting, which gives the user a wide variety of fixing areas, plus this product is Police approved!

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