Here is an ultra-thin sensor that lets you monitor your doors and windows for any intrusion. Strips by Sensative fits between your door / window and frame. It is under 3mm thin and has up to 10 years of battery. It works with Fibaro, HomeSeer, SmartThings and other smart home hubs. When any movement is detected, you get an alert on your smartphone.
Strips uses a magnetic sensor to let you know when doors or windows are opened or closed. It has an operating range of 4ºF – 140ºF and can be used indoors and outdoors.