Swapping your Glass Break Sensor

Unscrew and remove the cover from the base

The base could be mounted with adhesive (double sided tape) or drywall screws. If the bracket was installed using a screw, unscrew using a screwdriver or drill If it was attached to the wall using double sided adhesive, be careful as the adhesive may be strong. A putty knife or adhesive remover may provide a cleaner removal

Ensure the area is completely clean and dry prior to installing a new sensor

Follow the instructions on

how to install your new Glass Break Sensor