SOURCE: how do I remove the cover of an ADT home security
There is a plastic tab you will need to press to un-lock the door, it is located on the center rear of the unit, just be careful and don't pull too hard, it is plastic, this will expose the keypad and will require a code entered, you will need to pull this next cover down also ,again, another plastic tab holding it, should expose the area where there is wiring for a.c., ect, battery is inside compartment, need screw driver to open it, sometimes a screw was added to hold the doors, jfyi
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