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

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

Work fine stay at window-very loud

So the product is as advertised, too loud.I don't understand why these devices don't have a volume control, or why the selling point is the hearing-damaging decibel levels.Successfully placed a 10K ohm resistor between the power and the speaker and now it's still loud but won't cause permanent hearing damage.I also think the sensitivity, even on high, is too low for my purposes. Maybe if the glass breaks and falls to the floor the thing will go off, but we'll see.

Product works well

These are great! Very sensitive - and loud! Will definitely make some noise if someone’s trying to break in.

I tested them and they don’t always work.

I use these on all my windows and storm doors, they are not too large, but are effective at notifying you if anyone tampers with your windows/doors. They only require 2 triple A batteries for each unit.

The media could not be loaded. We have a ring system in our house but I just wanted to put this guys on skylights just in case we are at home and system is not on. Of course I had to test them. I think I was creative enough on my video:)) So it works and it’s loud! I think branches of the trees or birds could also trigger it if they don’t even break the glass but make a hit/vibration. But it’s the same as our ring glass detectors. We had false alarm a few times already when squirrel was demanding his nuts and was knocking the porch glass door. So it’s how it supposed to be.