Cavius 3103-002 User Manual page 7

The red LED will light up to indicate that 'Learn Mode' has been selected.
Please note that when the alarms are placed in 'Learn Mode' they can't be
inserted into the mounting base.
Do not take out the battery during 'Learn Mode' as this will interrupt the learn
process.
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Press the button at the top of one alarm only. This alarm will become
the master and will start sending out a specific house code to the other
alarms. The red LED will flash.
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