So your front door is always protected.
Simplisafe alarm on garage door.
When more than 2 inches away the sensor signals that it is open.
Even if you forget.
It locks your door the minute you arm your system or automatically on a timer.
When the door swings open it will trigger the sensor.
The simplisafe smart lock automatically locks up even when you forget.
When the magnet is within 2 inches of the grooves on the sensor it knows the door or window is closed.
In the diagram below the entry sensor has been installed on the doorframe and the magnet on the door.
The majority of break ins happen through an unlocked entry.