But it's not going to slow down a smart burglar if he can access it.

I will say they are very loud, but unless you have a very clumsy burglar that is going to slam the door when they break in then don't waste your money, I returned mine!

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

If someone hit hard on the glass to break it then it will blow out and make a high volume sound to scare burglar

Would it scare off a burglar

The good news is, if you put a stick in the sliding window, then you can be sure these alarms will go off whether a burglar were to smash or try to pry open the window.

Adds an extra layer of security and is a good deterrent to burglars when they see the dog decals.

If the window is broken, they should go off, which MAY help scare off the intruder/burglar, but I'll bet a lot of crooks would not care that much if it doesn't continue for more than the short time these go off

Does some burglar have to break the window before sounding the alarm or what here

But it's not going to slow down a smart burglar if he can access it.

I know it was the sound of this little alarm that scared the burglar away

I really wanted to like these as a supplemental security feature (bought 9) but after installing them, they are now all turned off now and nothing more than a security advertisement sticker on my windows (may deter some novice burglars at least?!).

If the burglar knows how to disarm it, he can in 5 seconds

It took me a while to get the battery alignment correct as there is no sign inside the battery compartment

Doesn't work as it should, bought two and use it on the sliding windows, no matter how I shake the windows or slide it , it won't sound the alarm

Works as it is supposed to.

It isn't sensitive enough when we are mowing or around the area but it worked as it should when we hit our glass window to test it.

I hope I never have to find out if they work as that would

It works just as it says

All 4 sensors seem to work as they should, but have scratches on them

And hopefully it will scare a would be intruder.

If the window is tapped or broken as in a robbery they will go off, and they are loud.