mini speaker support SD Card,U-flash, 3.5mm audio output built-in battery,7 hours mini size:300 ... the functions and the advantages of our mini speaker1,it can play music automatic by ... product feature Part number:SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource ... products covers from Mp3 player/Mp4 players,to mini speakers,etc.We are a powerful manufacturer ...