To do this, apply pressure to the rectangular area on the front of the device(shown in figure B) and pull the casing off. Then press the black tamper switch (shown in figure C).
Once you hear a beep on the system, it will display the blue screen shown below. "Sn" stands for the sensor number. The "Grp" number is used to change the behavior of the device. Then there is the default name "Front Door" which can be changed by scrolling up or down on the arrows on your keypad.
At the moment, the "Grp 10" will be flashing, indicating you are in edit mode. For the device, enter "13" and press "OK".
Now, the "Front Door" will be flashing. Scroll up or down till you have found the proper name and then select "OK" twice.
When the screen says "Trip Sensor 2", you can either continue adding new sensors or you can press the "Status" continuously till you reach the disarm screen.
You’re done! Reconnect the casing to the body of the glassbreak device.