4——“VOL -“: Short press this key to decrease the volume.
5——“❚⏪”: Short press this key to the previous song

6——“BASS +”: Short press this key to decrease the bass volume.
7——“USB”: Short press this key to quickly enter U disk mode.

8——“OPTIC”: Short press this key to quickly enter the optical fiber mode.

9——“AUDIO”: Short press this button to quickly enter the audio mode.

10——“MIC”: When the machine is equipped with a microphone, short press this button to cancel the original sound of the song, and it is invalid without a microphone.

11——“ECHO+”: When the machine is equipped with a microphone, short press this button to increase the microphone reverberation, and it is invalid without a microphone.

12——-“ECHO- “: When the unit is equipped with a microphone, short press this button to reduce the microphone reverberation, and it is invalid without a microphone.

13——“STANDBY”: Short press this button for remote on/off function.

14——-“Loop”: This button is the repeat playback function when the U disk is playing.

15——-“▶❚”: When playing U disk or BT songs on this unit, short press this button to play/pause.

16——-“⏩❚”: Short press this key to the next song.

17——-“BASS +”: Short press this key to increase the bass volume.

18——-“TIME”: Short press this key to quickly enter the time mode.

19——-“BT”: Short press this key to quickly enter BT mode.

20——-“COAX”: Short press this key to quickly enter the coaxial mode.

21——–“HDMI”: Short press this button to quickly enter the high-definition audio input mode.
22——–“MIC+”: Short press this button to increase the volume of the microphone with a microphone, and it is invalid without a microphone.

23——–“MIC-“: This machine with a microphone, short press this button to reduce the volume of the microphone, it is invalid without a microphone.

24——-“EQ”: Short press this key to adjust the audio mode (normal, classical, rock pop, jazz, live, club, dance, hall, soft)