Sena Bluetooth Bluetooth Audio Pack v1.0 User's Guide - Manual (Page 9)

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English
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You can mount the assembled frame case
to helmets, vehicles, and other gears by
using the GoPro® accessories: Attachment
Buckle and Thumb Screw (sold separately).
Powering On
Push the Power Switch down to power on, then
the LED will flash blue.
Powering Off
Push the Power Switch upward to power off,
then the LED will turn red and automatically be
turned off shortly.
OFF
ON