When the magnet is within 2 inches of the grooves on the sensor it knows the door or window is closed.
Simplisafe alarm on garage door.
So your front door is always protected.
Even if you forget.
The host explains that simplisafe s sensors communicate with the base on the 433 92mhz frequency which is very popular among other consumer electronics like garage door openers baby monitors.
The simplisafe smart lock makes sure your door is always locked.
It locks your door the minute you arm your system or automatically on a timer.
Doorbell pro alerts you when someone s at the door even if they don t ring the bell.
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.