iBasso Audio OX220 MAX, User Manual

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Charging the Analog Section:
Charge
16
With the furnished AC adapter (18V), the analog section can be
fully charged in about 2 hours. The battery indicator and status of
the analog section is displayed in the upper left corner, the first
from the left is the battery indicator, the second one is the battery
status. The indicator will display the lightning symbol when
charging, and it will show a red exclamation mark when the
battery is empty. When the battery of the analog section is empty,
the amp function cannot be used. At this time, the digital section
would not be affected. But there will be no sound when using the
3.5mm phone out, 4.4mm balanced phone out, or 4.4mm line out.