Wsdcam Glass Break Sensor Alarm 125dB Wireless Detector Vibration for Window Door Security - 4 Pack

These small alarms make a VERY loud noise when triggered by vibration. It is super easy to turn them on and off, to set the sensitivity and to install them. They will be great on our sliding doors and on windows close to the ground. They came well packaged and the price is very competative. I highly recommend these alarms

These work wonderfully. Just set the sensitivity level and stick on glass.

Good additional safety.

This is the second time I have purchased these alarms. I didnt want to run out, so I ordered more. My first set is still working well, loud and sensitive. I rest easier at night knowing that if anyone tries to enter the door window or other large window, they will get a surprise. It will give me enough time to get protection and police at the same time.

Got this because I'm getting a new patio door. I wanted to feel secure and not worry about anyone breaking glass to break in. .

Put two on a set of glass windows. Put it on Medium density for sound when I'm close by. I have put it on High alert when I'm far away from area (I can hear it from far). It's decibels alerted me as soon as window was opened. GREAT addition to have as an extra security. Kids Security Peace of mind Good Product!

These are terrific -- no screws needed, no magnets to line up flush, no apps to download so you (and hackers) can control your alarms, no subscription service to pay. They are well-made and work on doors and windows, just peel and stick and push the button to the 'on' position. You can set the sensitivity of the alarm - so a tap doesn't set it off, but it doesn't have to be a glass break either. (About mid-way seems good.) I bought 1 package of 4 and tried them. And then I bought another package of 4 - to get all my doors plus 1st floor windows. My objective is to know if someone has broken in while I am home and vulnerable. These alarms do that easily and cheaply. (If someone tries to get in when I am not home, I expect the alarm itself will make the criminal flee.)

Very sensitive but very noticeable.

I feel that they are not as loud as used to be also the battery covers come off non stop is cheaper plastic and also the battery used are small circle ones so when covers pop off they come out I'm scared my kids will get them while driving so I just gave up mostly the ones I got a few yrs back were so much better tbh

I did like that it was low-tech. Just remove the sticker on the back and stick it on the glass. However, only 3 in the 4-pack work. I asked Walmart if I could just exchange the 1 that doesn't work; they recommended contacting the seller directly. S/he never responded. Also, once you stick it on, it is not removable, so make sure you can still reach it to change the batteries. I have not had it long enough to change said batteries yet. The alarm is loud enough to hear on the second floor, but the sensitivity to vibrations could be better.