operation mode chip enters normal working state after power, if the audio input, screen display of spectrum. enter the work mode selection under normal working conditions, regardless of whether the display screen, hold down the "function key" and keep it, about 1-2 seconds after entering the " mode selection", the screen shows "sound", "representative to enter the channal selection" mode. according to the "keys", can chang the setting work mode, enter the working mode choice. short press can change working mode "option", option will be displayed on the screen. the user can according to need to set their own workmode.