1. USB input socket
2. Working state indicator lamp
3. Play/ Pause
4. Previous track/fast backward
5. Next track/fast forward
6. Power supply on/off and volume
7. MIC 1 volume
8. MIC 1 channel signal receiving indicator lamp
9. 3-channel mic audio signal indicator lamp
10. MIC 2 channel signal receiving indicator lamp
11. MIC 2 volume
12. TONE
13. MIC ECHO
14. MIC VOLUME
1. MIC 3 input socket
2. Line output socket
3. Line input socket
4. TALK OVER on/off and volume
5. TALK OVER indicator lamp
6. Line input volume
7. MIC 3 volume
8. CD power on/off and volume
9. Master volume
10. Tone adjust knob
11. Master power on/off and indicator lamp
12. Charging indicator lamp
4