Window Alarm System 4-Pack - Ultra-Loud 120dB Alarms with Advanced Vibration Sensors - Window Security Alarms for Glass Break Detection - Features Low Battery LED Indicator

Alarms arrived quickly and worked well. It was easy to install, although I switched the sticky pad to hide the alarm information (white/blank side to the window). I accidentally set it off when installing and it was sufficiently loud on LOW to hear across the house.

I have this alarm on all my windows, my front door, my garage door. Let me tell you this product is so awesome and super loud. Perfect for front line of defense for your front door, garage door and all your windows. I highly recommend put one on your door and the garage door. If someone try to kick in the door, the alarm is so loud that it will wake you up and scare off the intruders. There is a blinking red flash every two seconds on it just like your car alarm, but some how the battery just last forever

May need to order more of these now. They work great! Other than a sonic boom that happened after install when they all went off. 😁They install easily, are very loud, and sense all vibrations nicely and sound the alarm. The red flashing light also is a great visual deterrent. It flashes every few seconds letting a criminal know it’s working. You will need 8 AAA batteries (2 per) that are not included. The warning stickers are also a good deterrent. I’m recommending these for ease of install and piece of mind. 👍

The media could not be loaded. So here’s the deal. These things are a great addition to any home security system, or a great deterrent if this is the only security you have. Most home break in thrives do not want to be seen or heard. They also know there is no way to beat a stand alone window break sensor. If they see this in your front window they are just going to go somewhere else. And to me the blinking led is the best feature of this device. It’s a beacon to the thieves saying “I will hear you”.So how does it work? I have added a video showing me measuring the sound levels compared to the claims. My meter measured 115DB right next to the unit. That’s close enough to call the claim accurate. The video also shows the sound dissipation as you move away. The sound level is cut in half at about 10 feet. But unless you are a very heavy sleeper wearing earplugs, you are probability going to hear this go off in the dead of night.The fact that you get 4 for 25.00 is just icing on the cake. Put two facing the street In very visible places and two in the back on your sliding doors or windows. I am probability going to get another 4 to cover the rest of my windows. This is really a good product and I would definitely recommend it.FYI: I paid full price for this product and was not given any consideration for this review. In fact I search for “window break sensor” here on amazon and this showed up. Glad I found it. If you found this review helpful please indicate so below.

They work great, bought as an extra precaution for my windows

Good Product

These alarm items are smaller then it's advertising but hold a powerful punch. Definitely worth buying.

These are great! Battery life last a very long time, easy to install, great peace of mind having them on my basement windows.