Sena Bluetooth EXPAND v1.0 User's Guide - Manual (Page 7)

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3.2 Installing the Microphone Windscreen
The microphone windscreen helps you to cut down
incoming microphone wind noise by protecting
the microphone from the wind and provide clearer
voice audio sound under the circumstances where
the winds be very strong. Insert the microphone
windscreen at the end of the left side of the
microphone as shown below.
3.3 Powering On
Press and hold the Center Button and the (+) Button
at the same time for 1 second to power on. The blue
LED turns on and you will hear ascending beeps and
“Hello”.
3.4 Powering Off
Press the Center Button and the (+) Button
simultaneously (you don’t need to press and hold in
order for the system to power off). The red LED turns
on for about 2 seconds until it turns off completely
and you will hear “Goodbye” and descending beeps.
3.5 Volume Adjustment
You can easily adjust the volume by pressing the (+)
Button or the (-) Button. You will hear a beep when
the volume reaches maximum or minimum level.
The volume is set and maintained independently at
different levels for each audio source even when you
turn the headset off and on. For example, once you
set the volume for mobile phone handsfree, it will not
change even if you adjust the volume when you hear
Bluetooth MP3 music. So you can always maintain
the preferred optimum volume level for each audio
source.