... FM-SD-USB.2)Silence function.At the status of playing,press it for silence.Contrarily,press it ... long press for VOL-(Volume decrease).At the status of FM radio,short press for last broadcasting station, ... long press for VOL+(Volume increase).At the status of FM radio,short press for next broadcasting station, ... )Insert SD card,play the songs of SD card.8)Insert USB,play the songs of SD USB.9)Choose OFF, ...