4. SD card input: Insert SD card to play music.
5. USB input: Insert USB card to play music.
6. Repeat key, press this key to switch repeat one/repeat all/random: Repeat One: USB/SD
indicator blinks about 2 times per second; Repeat All: USB/SD indicator blinks about 3
times per second; Random: USB/SD indicator blinks about 1 time per second.
7. Previous track/Long-press for fast backward
8. Pause and play
9. Next track/Long-press for fast forward
10. Input mode switching key: select mode from AUX to USB/SD to Bluetooth
11. Electric Guitar input port
12. Electric Guitar volume control
13. Microphone echo control
14. Microphone volume control
15. Wired microphone input port
16. Power/Low voltage Indicator: It keeps on when the unit is powered on. When the unit is in
low voltage, it begins to blink.
17. Master volume control
18. Charging indicator: When charging, the CHG indicator blinks in RED. When charging is
almost completed, it blinks in GREEN. When completing charging, the indicator keeps on
in GREEN.