Sena Bluetooth SPH10H-FM v4.3 User's Guide - Manual (Page 17)

SPH10H-FM
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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 first intercom friend. The previous intercom
friend becomes 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.
8.2 Pairing with Other Sena Headset Models
for Intercom Conversation
The SPH10H-FM can be paired with all other Sena
headset models such as the SMH10 and the SPH10
for intercom conversation. Please follow the same
procedure as above to pair with these headset models.
A
B D
C
Pairing A & B
4. You can make other pairings between the headset
A and C, and between the headset A and D by
following the same procedure as above.
A A
B B D D
C C
Pairing A & C Pairing A & D