mini speaker support SD Card,U-flash, 3.5mm audio output built-in battery,7 hours mini ... the following device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such as PC,mp3/mp4 player,Mobile ... .5mm stereo jacksupport resource:U-disk,MMC/DC card,PC,MP3/MP4Power supply:DC 5v/Li battery,1000MAH,7--9hours. ...