Earbuds; External Antenna (Flip-Up Antenna Type Only); Getting Started; Charging - Sena SP38 User Manual

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3.4 Earbuds

If you want to wear your own earbuds, connect the earbuds to the
earbud port on the left side of the clamp. You can connect your
earbuds to the clamp while having the speakers connected to the
clamp. The sound of the earbuds will be active while the sound of the
outer speakers becomes inactive.

4 GETTING STARTED

4.1 Charging

You can charge the 20S by connecting the supplied USB power & data
cable into a computer USB port or USB wall charger. You can use any
standard micro-USB cable to charge the 20S. The LED turns red while
the headset is charging and turns blue when it is fully charged. It takes
about 2.5 hours to be completely charged.

4.2 Low Battery Warning

When the battery is low, the blinking blue LED in stand-by mode turns
to red and you will hear three, mid-toned beeps and a voice prompt
saying "Low Battery".

4.3 Checking the Battery Level

You can check the battery level in two different ways when the headset
is powering on.
20S
15

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