mini speaker support SD Card,U-flash, 3.5mm audio output built-in battery,7 hours mini ... and the advantages of our mini speaker1,it can play music automatic by the support of the following device:A,memory ... /MP4Power supply:DC 5v/Li battery,1000MAH,7--9hours.function:music player/loudspeaker/color:silver,black,ect technical parameter: Output power ...