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Steadily on when the handset booster is activated.
Steadily on when a mobile phone is paired and connected.
or
Steadily on when a mobile call is in progress.
Steadily on when a Bluetooth mobile phone is paired and
connected.
Press to initial an intercom call when idle.
(INT)
Press to go back to previous menu level or cancel the current
action if applicable.
(BACK)
Press to clear a character or stop the alarm if applicable, press
to mute / unmute during a call.
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