So you want to monitor your doors and windows? You could use one of these Schlage RS100HC V N N SL Home Door and Window Sensors. Use it to see if your doors and windows are closed at night. You can also set Nexia to notify you when doors and windows have been opened. It works with Nexia Home Intelligence to make sure the temperature inside your home doesn’t go up or down dramatically.
These sensors allow you to use a mobile app to view their status in your home.Sets you back under $40.