Placing the sensor and magnet at top end corner of door / window
Clean the surface of door beam and door panel with dry cloth.
Peel off the double sided foam tape cover from sensor.
Stick sensor at the top end corner of door panel.
Now, peel off the double sided foam tape cover from magnet.
Then stick the magnet to door beam.
Not to forget, positioning the magnet near sticker label
“MAGNET POSITION” of sensor.
Sensor & magnet must not touch each other. ( To test, if you open the door, red LED on the sensor will illuminate. )
Change 9Vdc Alkaline battery :
Slide open the door cover of sensor
You can see a 9Vdc Alkaline battery inside
Just pull out the cable and change it.( Change the battery once a year. )