Sena Expand Boom User Manual page 15

B
Pairing A & B
4. You can make other pairings between headsets A and C, and
between headsets A and D by following the same procedure as
above.
A
B D
C
Pairing A & C
A
D
C
A
B D
C
Pairing A & D
5. The intercom pairing queue is 'Last-Come, First-Served'. If a
headset has multiple paired headsets for intercom conversations,
the last paired headset is set as the first intercom friend. The
previous intercom friend becomes the second intercom friend,
and third intercom friend.
Note:
For example, after the pairing procedures listed above, headset D is the first
intercom friend of headset A. Headset C is the second intercom friend of
headset A, and headset B is the third intercom friend of headset A.
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