... and the advantages of our mini speaker1,it can play music automatic by the support of the following device:A,memory ... than other supplier. product feature Part number:SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource ... MP4Power supply:DC 5v/Li battery,1000MAH,7--9hours.function:music player/loudspeaker/color:silver,black,ect technical parameter: Output power ...