Diagram and functions
1. USB Slot
2. LCD Display
3. Micro SD Slot
4. Headphone jack
5. On/Off Switch
6. Back key
7. Menu key
8. Volume + (increase volume)
9. Volume – (decrease volume)
10. Previous Track / Rewind / Up navigation
11. Next track /Fast forward / Down navigation
12. Play / Pause / Off button (hold to turn off)
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