mini speaker support SD Card,U-flash, 3.5mm audio output built ... device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such as PC,mp3/mp4 player,Mobile ... multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/DC card,PC,MP3/MP4Power supply:DC ... products.our plastic products contain the covers of Mp3 players/Mp4 players,digital cameras,headphones,etc.and ...