12) Type C data/charging port: The Type C port marked USB3.0 supports data
transfer, common charging, USB HOST, USB OTG and so on.
13) 4.4mm balanced output: supports 4.4mm balanced headphone/line-out
output.
14) 3.5mm headphone/line-out/SPDIF output: shared outputs of line-out and
PO. Go to the menu of Settings->Audio->Output selection to switch to
corresponding modes.
The priority of the M21 output port
1. When the 3.5mm and 4.4mm earphones are inserted at the same
time, the output will be given priority in the order of insertion.
2. According to the Android system's own processing method, Bluetooth
transmission and analog output (including SPDIF) will follow the principle of
post-access priority.
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