Sensitive to vibration and makes a loud piercing noise when activated

If someone forces the door open (e.g. by kicking it) they will be greeted by sudden loud noise.

it's very sensitive to vibration and loud noise

So at the expense of knowing 1-2 times per day a very loud noise will just randomly sound (with young children nap schedules to consider or the family sleeping), these are now all off.

if you're looking for an alarm to add additional noise to scare a burglar when breaking or prying glass to make think there's alarms or if you live in close proximity to your neighbors or just looking to get a warning when someone is trying to get in then this works perfect

Of course I have yet to find a situation where these proved me wrong, but I think you should only get these if you have something which is likely to make a loud noise as it is being opened, breached, or whatever the case.

We received these and immediately tested and installed them on two sliding doors that are already secured, but we like the loud noise factor of these small alarms

either I have really big bugs that hit windows or these things can detect earthquakes around the world; while I fully believe I may have had false alarms from maybe a bird hitting the window or maybe my family made a noticeable bang in the house that would trigger the vibration sensor in the alarm but there were several times when I would be in the same room, not moving, no loud noises on a T.V. or something, and did not hear any bang from a window to indicate something from the outside hit the window, but these would still just randomly start sounding.

They work great and the noise is definitely enough to ward off any potential intruders

They make enough noise that they activate my interior camera's.

they don't go off accidentally and work when i test them out by banging on the window with an extremely loud noise for 30 seconds.

The am sure that when the intruder make a plan to break the window , they will be faced with scary loud noise , they will think it twice

We have a very smart dog that can get break out of doors/windows, and who also hates loud noises

These will go off without warning, if the wind blows too hard they start screaming,shrill horrific noise

He dislikes the noise, and after setting off the alarm just a couple of times, he stopped trying to slip out when no one was looking

A great noise deterrent and will scare off anyone trying to break-in

but it fares pretty well with lightining and thunder storm during Harvery here in Houston as not much noise then.

Loud piercing noise is heard once activated

The few that get in the alarms make enough noise, a resident tells her

I tested them and they go off very, very loudly when either there is a loud noise or they get hit (ie

Fantastic & I love it😎