support U-disk,SD card built-in Li battery,1000mAh/dc 5V ... device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such as PC,mp3/mp4 player, ... speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/DC card,PC,MP3/MP4Power supply:DC 5v/ ... contain the covers of Mp3 players/Mp4 players,digital cameras,headphones,etc.and our digital products covers from Mp3 player/Mp4 players, ...