speaker support SD card,U-disk, external Li battery/DC 5V 3 ... support of the following device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such as ... product feature Part number:SG-339 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/ ... DC card,PC,MP3/MP4Power supply:DC 5v/Li ...