The POWER IN port only supports PD2.0/3.0 fast charging, while other types are
recognized as normal charging. When connected to PD3.0 fast charging via the
POWER IN port, the maximum charging current can reach approximately 3.5A.
The USB 3.0 port doesn't support fast charging.
Battery capacity: 4000mAh
Battery life:
15 hours (3.5mm standard headphone out)
11.5 hours(4.4mm standard headphone out)
9. How to enter the tape mode?
After installing the tape case, the M21 will automatically enter tape mode. For
detailed instructions, see the following figure:
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