Sena Bluetooth SM10 v1.1 User's Guide - Manual (Page 14)

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5.2 Bluetooth pairing with the second headset
1. Turn on the second Bluetooth headset. (Refer to the headset
user guide).
2. Place the second Bluetooth headset in pairing mode (Refer
to the headset user guide).
3. Press the Pairing Button for 9 seconds until the Red LED is
rapidly flashing.
4. The SM10 will detect the Bluetooth headset nearby and
connection will be made accordingly.
5. If the second headset is connected, the Red LED will slowly
flash.