mini speaker support SD Card,U-flash, 3.5mm audio output built-in battery ... the support of the following device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such as PC ... Part number:SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/DC ... card,PC,MP3/MP4Power supply:DC 5v/Li battery,1000MAH ...