Sena Bluetooth EXPAND v1.0 User's Guide - Manual (Page 28)

EXPAND
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intercom connection with your second intercom
friend (C). To disconnect from intercom friend (C),
press twice the Center Button. Now both intercom
friends are disconnected.
Center Button Result
Press and hold for 1" Disconnect (B) & (C)
Press once Disconnect (B)
Press twice Disconnect (C)
End Three-way Intercom
10.4.3 Three-way conference phone call with
intercom participants
You can have a three-way conference phone call
by adding an intercom friend to the mobile phone
conversation. While having a mobile phone call, make
an intercom call to one of your intercom friends (B,
C or D) by pressing the Center Button once, twice or
three times to form a three-way conference call with
the person on the mobile phone line. To disconnect
the intercom first and go back to your private mobile
phone call, terminate the intercom by pressing the
Center Button once. To end the mobile phone call
first and maintain the intercom conversation, press
and hold the Center Button for 2 seconds, or wait for
the person on the mobile phone line to end the call.
Start
Press the Center Button while having a
mobile phone call
End intercom
first
Press the Center Button
End phone call
first
Press and hold the Center Button for 2"
or
Wait for the called person to end the call
Start & End Three-way Conference Phone Call