... U-Disk,etc B,mobile device,such as PC,mp3/mp4 player,Mobile phone,etc2,it has a small ... stereo jacksupport resource:U-disk,MMC/DC card,PC,MP3/MP4 playerPower supply:DC 5v/Li battery,1000MAH,7--9hours ... workshop assembly∨ our final advantage:1,as the plastic cases and the surface treatments are made and done by ... we can strictly control the quality of the plastic cases and make the cost down2,we can save ...