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Input:
Question: I would like to put these on a couple of patio style french  doors (center pane of glass 2' x 5').  Will closing the door with normal force set it off
Document: Easy to put on french door window and with a good bump or knock it will sound off. Not as loud as I would like but hopefully the mere presence of the alarm will cause an intruder to stop.
I bought two of these, one for a window and the other for the sliding glass door. They are small and on the reverse side it has a red logo with a dog. I like that it shows people on the outside that I do have a security system. It is very easy to set up, you just peel off the sticker on the back and stick it on the window. You flick the switch to on and after a couple seconds it beeps to let you know it works. We have had a couple of windstorms the past few days and it never set off the alarm.
These work great, and give you a little extra peace of mind at night, knowing you have one more level of defense regarding break-ins. They are pretty sensitive to glass disturbance, but they don't go off if you are just closing the doors. Important:  these are not designed to trigger for doors opening, or lock cracking, more like for window breaking. If someone tries to smash your window, these will sound, but not if someone manages to get your sliding door or window open. Another tip: make sure you mount them where they will not be disturbed by your sliding door movement.
So far I'm pleased with these sensors. They are quite sensitive to vibration and working as expected with no issues or false alarms. They are thin as well, and can be used on sliding patio glass doors. And the alarm is loud, as I found out one night after accidentally setting one off. I like having these as an extra deterrent for someone thinking of breaking in, and have used them on doors that could be pried as well.My next door neighbors house got broken into a few weeks again and I was right outside when it happened.
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.Unlike others I don't think an intruder would need to crack the glass to set these off, even a good knocking or jostling on the window set them off when we tried them out. Which is exactly is what I expected and received.They set off a loud, shrill wail which we could easily hear from even two floors away.Combined with other security this will add peace of mind to the home.
Stuck this on a glass sliding door.... And it works great for me. I hit the window a couple times, nothing... I then hit it a little harder, and the alarm went right off. If I had hit the window any harder, it would have broke for sure. So for me, it works exactly how I wanted it to... Where it won't set off for minimal vibration, but just at that point before the window could be smashed in. Be mindful that I also placed it in the middle of the glass sliding door.
They adhered very well to the window and as I have double-paned windows I put the alarm high on the lower pane, then gave a thump to the upper pane and the alarm went off. You really don't need to alarm both panes but if it makes you feel better go for it.I like that the LED doesn't stay on, which help conserve battery power.For the price this is an excellent layer of security to have. It isn't so sensitive that it gives off false alarms in a heavy wind, but it definitely responds to a significant vibration to the glass.
I just did mine - my sliding glass doors have a bottom height adjustment screw for the lower door track that needed to be lowered. I added three stainless screws along the top frame of each slider after adjusting the door height, and slowly adjusted the three screws to prevent them from being forcefully lifted off the sliders. I added security bars to the sliding glass doors, too. Another good recommendation is adding extra long screws in all door lock and hinge hardware. I pulled a couple screws for sizing, headed to Lowe's to compare the size, and changed them all with 3 1/2 inch wood screws.The timer automatically shuts the alarm off after approximately one minute.
I can open and close my sliding glass door and slam it and it won't go off. I tried breaking into my place through the sliding glass door and it didn't go off. I threw all my body weight into the door and nothing. If you knock on the window next to it, it'll for sure off, has to be specific vibrations in the glass. Opening and closing a window/door won't make it alarm.But breaking a window or knocking on it will.I got it for $8 at Home Depot so I'll probably just keep it cause the sticker on the back says it's an alarm and it does look like its a motion dectector/alarm remote so it'll probably deter someone.
I purchased these for a couple of windows. They work well, and only go off when the window is hit pretty hard. They are thin enough to slide the window over when opening. And loud enough that even the neighbors would hear. I did have to purchase 4 of these for 2 windows, one for each side/pane.
Answer: Yes, that would definitely set it off. I have it on a window, and you can't open or close it carefully enough to not set it off. But then that's why there's an off switch!