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 ... SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/ ... covers of Mp3 players/Mp4 players,digital cameras,headphones,etc.and our digital products covers from Mp3 player/Mp4 ...