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

I have put all four of these alarms in my windows. They are very loud and sensitive to vibration - so perfect. I’ve put them on my patio doors and on a couple of my windows. The adhesives was very good and the install was very easy. Took me about ten minutes to do all four. The flashing red light is also a great deterrent.

These are very loud, on par with a smoke detector. They were easy to install and they are sensitive. My dog likes to look out the window and when she hit the window it went off. Definitely worth the price.

Ive used this product now for over 4 years on two different houses. I love the fact they have a warning sticker facing outside to scare any would be thieves. Also, there is a sensitivity adjustment unlike some other brands. My only false alarm out of owning 16 of these units may have been caused by a bird hitting the glass. Otherwise, you can place on glass doors and opening and closing of the doors do not set this devise off. If needed, the sound is very loud. Very happy and will buy again.

We purchased these for an RV road trip through Washington knowing that the trailheads are often targeted inside the national parks. I accidentally set them off a couple of times and they are LOUD. I specifically purchased these ones because they are extremely easy to spot from the outside and they have a flashing light that couldn’t be missed at night. My only critique would be that they cannot be easily removed once attached (which might be a good thing for some people). Our RV was a rental so they needed to come off and I had to pry them so hard I was nervous it would bust the window. It would be a good option to have some that suction on instead.

Great product

Works loudly.

I pounded on the window but no alarm went off but easy to set up just hope they work if there is glass breakage

I have read a few reviews where they stated the alarm did not go off, not sure of what they were talking about. These alarms are sensitive and they do go and are LOUD. I took some frozen pineapple out of the freezer and put them on the cutting board and banged them to separate for my smoothie, now this is in front of my kitchen window where I have an alarm placed. Well, that set the alarm off and nothing touched the window at all but the vibration from banging the pineapple did. Secondly, I placed one on the inside of my storm, glass back door, at first I tapped on and around it but nothing happened; however, when I closed the house or interior door, the vibration from that door triggered it. So tapping it doesn't seem to do anything but just like it states vibration or breaking of the glass is what sets it off. Hopefully, there will not be any glass breaking but I'm sure it will go off it went off from that! I Love the red blinking light feature, that in itself is a great deterrent, not to mention the sticker. This is a great add on to any security system one might have. Actually, they're sufficient by themselves if you don't have security cameras or a traditional security system. I have them in all of my windows and storm glass doors. They do provide another layer/barrier of protection and peace of mind, especially combined with my outdoor security cameras, motion detector flood lights all around my property, and Interior door alarms and motion detectors. They did a good job with these alarms...

They do work especially if I open the patio door and forget to turn it off! The flashing light is hopefully a deterrent and the sticker on the back that goes against st the wi down another warning. Highly recommended

Excellent. The batteries so far with it blinking 24/7 has lasted 4mths. I live the warning light and decal as would be thieves will be able to see you have glass break vibration from the outside so a great deterrent. When installing the batteries the alarm will sound and it is ver loud. I have a dog and it was so loud and high pitched that I had to go into another room and close the door to put in the batteries as it even hurt my ears. Just turn it off immediately after inserting batteries but you do want each to go off initially ti ensure it works.

One of the teeth is broken

Works great

Muy bueno la alarma se escucha bastante fuerte, solo aveces he probado y no se activa, no se si necesite mas sensibilidad