The module features:  1. Support signal directly switching.  2. Support USB / SD / FM / LINE switch automatically.  3. Module containing MP3 / WMA / lossless WAV / song decoder chip.  4. Support USB, SD, MMC card to play.  5. Support USB / SD card switch the previous song / next song, fast forward, rewind, volume control, EQ, play / pause, stop, single repeat, mute, shutdown, elections songs. 6. Support the power and memory function.     The panel buttons:  1, "PREV / VOL-": Set long press volume down;  in USB / SD status short press for previous track; in FM state long press for radio station.  2, "PLAY / PAUSE": In USB / SD status short press Play / Pause; in FM mode, long press is search  channel and storage station.  3, "NEXT / VOL +": Set long press volume up; in USB / SD status short press previous track; in FM state short press for radio station.  4, "MODE": When have an SD card and U disk: Change order for USB → SD →  FM → AUX; only have an U disk: switching sequence for USB → FM → AUX;  when only have SD card: Switch the order for SD → FM → AUX;     Remote Control Key:  1, POWER: Standby (STANDBY) This key can not switch.  2, "MODE": When have an SD card and U disk: Change order for USB → SD → FM → AUX; only have an U disk: switching sequence for USB →  FM → AUX;  when only have SD card: Switch the order for SD → FM → AUX; no USB and SD card: FM → AUX &rarr.  3, "PREV": Set long press volume down;  in USB / SD  status short press for previous track; in FM state short press for radio station.  4,  "NEXT ": Set long press volume up; in USB / SD status short press previous track; in FM state short press for radio station.  5, VOL +: short / long press the volume increase.  6, VOL-: Short / Long press for volume reduction.  7, REP: USB / SD while playing is between single repeat or all cycle toggle key, open machine for the all cycle.  8, "STOP": In USB / SD state, short press is stop music playing.  9, MUTE: Mute button, gently press is mute, press again is lifted(press VOL- / VOL + can also be lifted).  10, EQ:. Sound field mode: NORMAL → BAS → POP → ROC → JAZZ → CLA → CUT → NORMAL.  11, PLAY / PAUSE: In USB / SD status Play / Pause; in FM state long press for radio station.  12, 0 ~ 9: In USB / SD state select key, more than 10 songs need to continuous input what you want number; In FM state select key, can be directly input radio frequency and channel number.  Application:  Used for home audio / car CD modified mini speaker DIY production.     Package included:  1 x 5V/12V MP3 audio decoder board.  1 x Surface shell.  1 x Remote control.  2 x 3P/5P audio plug thread