Doberman Security Sensor Detector Door Window Vibration Alarm for Warning Burglars Intruder Home Security Alarm

I was looking for something to add to my sliding glass door as an alarm over my doggie door attachment & this did the trick. It's small & slimlined , about the size of a thin cookie. Uses a sticky patch on the back for installation, couldn't be simpler. And that sticker has a security warning on it that's visible from the back side of the unit. It's really sensitive to any vibration, movement or even sound near the unit & it's controlled by a simple on/off switch on the face of the unit. And yes- it's loud. No app, wifi or tech needed. I just turn it on at night before I go to bed & turn it off before letting my dogs out in the morning.I'm assuming the battery life will be pretty good. Since it's only actually turned on at night & so far, hasn't had any reason to go off (other than me setting it off by mistake a few times).For the price , I'd buy a few more if I needed them.

Product is great and is very loud

I got this hoping to use it for my back door, but it didn't go off when I shook the door. However when I did get it to go off man was it loud. Would probably be better just for windows

Bought 4 then ordered another set for my parents, loud, easy to install, used on exterior doors.

I bought this primarily because of the red warning sticker on the back that would be viewable from outside. However, the product I received was simply blank white with no warning sticker (and the front was labeled HITGX instead of Doberman, which is probably the issue.