... 2.0 audio 12v/5v/6v 5.Oem 12v stereo USB SD FM IR AUX mp3 speaker module The ... , putting the playing function for USB and SD card absolute Power Amplifier,and stereo FM radio (87.5—108MHZ ... press for 3 secondsRemote controller function1, MODE,Mode key, USB flash disks and SD cards transform each other, AUX ... which are unstable or poor speed.3. When both USB flash disks and SD cards are inserted, jump ...