... :1x3.7V Li batteryFeature:1,Automatically detects USB flash drive /TF card and play2,Fully compatible with USB 1.1/2.0 ... U disk3,Support TF card4,Support MP3,MPEG 1,MPEG2,LAYER35,With mini flash ... light5,With four functions to switch:TF,USB,AUX,FM radio6,Made of environmentally friendly material:ABS ...