Window Alarm 4 Packs - Loud 120dB and Vibration Sensors Compatible With Virtually Any Window - Glass Break Security Sensor - Low Battery LED Indicator

I bought a 4 pack about 5-6 months ago and they work great. They are super loud and are still working with no issues. They have different sensitivity levels, so you could make it super sensitive or less sensitive depending on your needs.. I would definitely purchase again.

Great product. Alarms are very loud and I like that it takes rechargeable batteries.

Works great

I assuming battery life will be good but haven't had them long enough to validate but there's only a flashing red LED to use the battery on an ongoing basis.Added these to my basement windows and my sliding door. They are loud if you set them off accidentally and will certainly wake you if someone tries to break in while you're sleeping. I don't always set the alarms while I'm home and these would certainly alert me if someone tried to get in. There is a decal and a flashing light to deter anyone from trying. Would certainly buy again at this point.

Super easy to install, but because they are so large you need to think about where you're putting them. Make sure you can slide off the battery case when it comes time to replace the batteries. One of mine I stuck too close to the wall next to the window (live and learn!) and will probably have to peel it off when it comes that time because I didn't think it through until AFTER I stuck it on. The adhesive is very strong! They are large, so if you want to put them on the stationary part of the window, make sure you leave enough room to open the window. I love the flashing red light, which is easily visible from outside, and lets people know that there is an alarm. I like to think this is a deterrent in and of itself. Even if it's not, the alarm seems to be adequately sensitive. I have one on a living room window and was having new flooring installed. The installer dropped a tool near the window (it was a pretty loud bang when it hit the floor) and that set the alarm off. I was very relieved to know that it worked. Let me tell you, the alarm is LOUD! I heard it over the power tools the intallers were using--it got everyone's attention. I mentioned the flashing red light--think about how that might be seen from inside your house before you install these, too. One of my alarms is in my living room and I had to place it so it won't be seen at night from inside. That would be super annoyng. I can see where it could be an issue in a bedroom if there's no curtain or other window covering that could block out the light. Overall, I am super happy with my purchase and I feel more confident that those vulnerable windows are less vulnerable now. I like that these use AA batteries, because I always have a number of them on hand, but that is what makes the alarms so large. So, bottom line, make sure the size of these alarms works for you and that the flashing red light won't bother you. I would recommend this product.