JK6839 USB SD FM MP3 decoder board with aux

JK6839 USB SD FM MP3 board with aux 1, USB SD FM MP3 board with aux Functions: USB/SD/MP3/Line in (AUX)/FM MP3 decorder support 32–320kbps FAT16 or FAT32 systems supported 4 Keys: MODE, NEXT/V+, PLAY/PAUSE/SCAN, PRE/V- With Remote control 2, Keys function: MODE: USB/SD/AUX/FM switch. Long press 3 seconds for power ON/OFF NEXT/V+: Under MP3 mode, short press NEXT, long press VOL+. Under AUX mode, press VOL+. Under FM mode, short press to selection up, long press VOL+. PLAY