Connectivity and funtions:
1. DC 15 V IN
2. MIC Slot
3. MIC Volume
4. Echo
5. Volume
6. Bass
7. Treble
8. Guitar Volume
9. Guitar Slot
10. Audio Output
11. Audio Input
12. TF Slot
13. USB Slot
14. Power switch
15. Input selection
16. Previous
17. Play/Pause/Scan
18. Next
19. Repeat
20. LED light Control
21. Record/Play Record
22. MIC Priority
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