3) Play/Pause: short press it when music is playing to pause the music;
short press it when music is paused to resume the playback.
4) Next track: short press to play the next track; long press to
fastforward.
5) microSD card slot: supports one TF card (micro SD card),
theoretically up to 2TB expansion.
6) Volume up/down: press the volume up button to increase the
volume, press the volume down button to decrease the volume.
7)
USB Type C transfer/charging port: used for charging, data
transmission and USB Audio.
8) 4.4mm balanced output: supports 4.4mm balanced headphone
output.
9) 3.5mm headphone/line-out/SPDIF output: shared outputs of line-
out, spdif out and PO
The priority of the JM21 output port
1. When the 3.5mm and 4.4mm earphones are inserted at the same
time 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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