4. Volume Up
* press to increase volume.
5. Volume Down
* press to decrease volume.
6. Micro SD card slot
* expand storage, supports max. 256g TF/Micro-SD card
7. USB-C & OTG Port
* used for charging and file transfer
8. Back
* click to come back to the previous page.
9. Play/Pause
* start/pause the playing music.
10. Next/Fast-forward
* during music playback, short press to switch the next song
* hold to fast forward.
11. Toggle/Menu
* while music playing, press to toggle lyrics display or album cover
* pop-up menu for play settings and other options
12. Previous/Rewind
* during music playback, short press to switch the previous song;
* hold to fast backward.
13. Reset button
* short press reset button to reset when freeze/stuck.
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