Door sensors can also help keep your snack habits in check. Attach one to your refrigerator or freezer, and you can monitor when it's been opened. With smart notifications or time-based routines, ...

Door sensors are some of the simplest smart home devices you can get. Instead of anything fancy like measuring the heat or motion, all they do is detect when their two halves are separated. Yet, that ...

Add Yahoo as a preferred source to see more of our stories on Google. Door sensors are some of the simplest smart home devices you can get. Instead of anything fancy like measuring the heat or motion, ...