Sena Bluetooth SPH10H v4.2 User's Guide - Manual (Page 7)

SPH10H
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2. Please make sure that one of the headset ear pads
with the microphone is located on the left side of your
helmet.
3. Tuck in the cable that connects left and right ear pads,
between the helmet shell and protective padding or
inside the helmet.
4. POWERING ON/OFF AND CHARGING
To power on and off the headset, you don’t need
to press and hold any button for several seconds.
Just short press the Jog Dial and the Phone Button
simultaneously, and you will get quick on-and-off
convenience.
4.1 Powering On
Press the Jog Dial and the Phone Button at the same
time for about 1 second to power on. The blue LED
turns on and you will hear ascending beeps.
4.2 Powering Off
Just short press the Jog Dial and the Phone Button
simultaneously, you don’t need to press and hold for
a few seconds. The red LED turns on for a while until
it turns off completely and you will hear descending
beeps.
4.3 Charging
The LED turns on red while charging, and turns to
blue when the headset is fully charged. It takes about
2.5 hours to be completely charged.