... , Previous, Next, Mode Switching. Plug Microphone to the slot, it will be speech amplifier, microphone ... volume and reverb effect can be adjustable to enhanced sound spot effects. Another external audio ... key of MP3,FM, Main interface[MAIN]: Return to main interface[MENU]: Menu and Enter[PLAY]: ... NEXT]for date adjusting. Press ENTER and PLAY to return MENU.MUSIC:Press [MUSIC] for enter, long ...