Step1  Select the door that will have a door sensor. Clean the interior surface of the door so it is free of any dirt or gunk. Also clean the area of the wall where you plan on attaching the main unit of the door sensor kit.
Step2  Round up a screwdriver, electric drill and a carpenter’s pencil, as well as a level. You may also need a stud finder and/or drywall anchors.
Step3  Use the stud finder to locate a stud as close to the top of the door frame as possible. If you can’t find a stud, you will need to use the drywall anchors to make a secure attachment to the wall.
Step4  Hold the main unit of the door sensor up to the wall. Level it, and then mark where the top of the unit is on the wall with the carpenter’s pencil. Also mark the location of the unit’s screw holes on the wall.
Step5  Drill pilot holes for the screws. If you are not drilling into a stud, make holes for the drywall anchors instead, then insert the anchors into the wall. Screw the unit to the wall.
Step6  Pick a location on the door and on the door jamb to install the magnetic switches. The switches have to be placed so that they will come in contact with each other when the door is closed and contact is broken when the door is opened.
Step7  Mark the location of the magnetic switches and drill pilot holes. Attach the magnetic switches. Now, set up your home security system to recognize signals from the newly installed door sensor.

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