... quality than other supplier. product feature Part number:SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport ... MP3/MP4Power supply:DC 5v/Li battery,1000MAH,7--9hours.function:music player/loudspeaker/color:silver,black,ect technical parameter: Output ... our digital products covers from Mp3 player/Mp4 players,to mini speakers,etc.We are a powerful manufacturer with the ...