It's a good product, but VERY sensitive. We have it installed on our French Doors and we did have to play around with the settings to prevent it going off unnecessarily.

However, once we'd found the knack of managing it, it works very well.

This device works very well or very badly depending on your viewpoint.

I used on a bifold door, the device armed the main system when a vibration was triggered on the door ...it could have been a bird flying into the door or an intruder who knows?

This device apparently is for safes and fixed items indoors ...perhaps not suitable for doors due to its sensitivity.

Very sleek and attractive little unit. It has a modern feel and appearance which means it looks neat when attached to the window or whatever else you want to attach it to. I bought two of these for my french doors but after fitting the first and checking the vibration required to activate it I realised I wouldn't need two so fitted the second one to the window in my collection room instead to increase security here. Unfortunately the adhesive pad on one of the units failed and it fell off but I easily fixed the problem with a special adhesive. The whole system works together perfectly and is a great peace of mind for when we are away from home.