... MMC card,USB,mobile phones,MP3,MP42,With FM Digital Multi-functional USB Speaker Operation Manual Detail:1. Charging ... play MP3 documents in SD/MMC card and USB device, it is also a FM radio during the ... have to switch among SD, MMC cards and USB device, speaker can read devices plugged in intelligently. 4. Speaker ... MP3, MP4, PC and so on. 5. USB device and SD/MMC card can be switched by hand to ...