Sena Bluetooth SMH5-FM v1.3 User's Guide - Manual (Page 26)

English
SMH5-FM
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- To play or pause music, press and hold the Jog Dial for 1 second
until you hear a double beep.
- To track forward or track back, rotate while pressing the Jog Dial
clockwise or counter clockwise.
11.10 Function Priority
The SMH5-FM operates in the following order of priority:
(Highest) Mobile Phone,
Intercom,
Music sharing by Bluetooth stereo music,
FM Radio,
(Lowest) Bluetooth Stereo Music
A lower priority function is always interrupted by a higher priority
function. For example, stereo music is interrupted by intercom call,
and intercom conversation is interrupted by incoming mobile phone
call.