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The modes that can be switched are USB mode, AUX
line mode, Bluetooth play mode and FM radio mode;
17. LOOP Volume Adjustment Button
Adjustable volume of MIC4/LINE4, EMC, Chime,
and SIREN, volume 0-32 (for detailed operation,
please refer to No.8 of the "Operating Instructions"
item below);
18. Display screen
19. Chime button
20. Next song / (FM mode for next program)
In USB and Bluetooth modes, press this button to
the "next song";
In FM mode, press this button to the "next
program";
In FM, AUX, USB, SD and Bluetooth modes,
long press this button to turn down the volume of
MP3 sources (including FM, SD, USB and
Bluetooth)
21.Infrared Remote Control Receiving
22. Previous Song / (FM mode for previous
program)
In USB and Bluetooth modes, press this button to
the "Previous song";
In FM mode, press this button to the "Previous
program";
In FM, AUX, USB, SD and Bluetooth modes,
long press this button to turn up the volume of
MP3 sources (including FM, SD, USB and
Bluetooth)
23. Play/Pause
In USB and Bluetooth modes, press this button to
Pause;
In FM mode, press this button to the search;
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