4
1.Mic Vol Knob
2. Master Vol Knob
3.Bass Vol Knob
4. Mode Key
5.Light Key
6. Rep Key
7. Track Previous
8. Play / Pause
9. Track Following
10. Mic Input
11. TF Card Slot
12. USB slot
13. AUX IN Port
14. USB Charging Port
15. Charge Indicator
16. Power ON/OFF
Control Panel: