1, Functions instruction: Full functions, high quality 1), In USB device can play MP3/WMA format, and operate simply. 2), Support MP3/WMA format 3), IR remote control can control in 8 meter. 4), LCD display. 2, Main board keys operation instruction: S1: (PLAY/PAUSE/RANDOM) Short press for play or pause circularly. Long press for on/off random play function. S2: (PREV/VOL-) Short press for LAST, long press for VOL-. S3: (NEXT/VOL+) Short press for NEXT, long press for VOL+. 3, Relating parameters: Main board Dimensions: 80*36.6mm LCD board Dimensions: 36.5*31.1mm Voltage: DC12V Electricity:150mA(Max). 480 Pieces/CT,64.5*34.5*33.3cm.