... of the following device: A,memory card,such as SD/MMC card,U-Disk,etc B,mobile device,such ... -339 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC/ ... DC card,PC,MP3/MP4 playerPower supply:DC 5v/Li ... electronical parts. accessories:function1 pcs 3.5mm audio cable connect external sound source such as PC,phone,MP3 player ...