To mount the Long-Range Door and Window Sensor, place one piece on the door (or window) itself and one piece on the frame.
Ensure that the sensor is set up as follows:
The notches on the two pieces are aligned
The two pieces are less than 3/4" apart (less than a thumb’s width of each other)
The two pieces are flush on the same plane.
The door is within 100 ft. of the Control Panel.