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The user-defined options 2/3/4/5 buttons election, press the corresponding button for election.
4.2.6 Fire Alarm
When the controller sends a fire alarm message, the unit screen will prompt "fire caution”, the
microphone red light will flash until the controller cancel the fire alarm, and the unit will recover to
normal state before alarm. Fire alarm is with the highest priority and the key become invalid.
4.2.7 Menu page
Enter into menu page, as shown below, there are language setting, volume adjustment, brightness
adjustment and service application.
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