Aluminium TF/SD Screen Mini Digital Speaker 1)ROHS,CE,FCC 2)With USB and ... 3)Support SD/TF card,USB Aluminium TF/SD Screen Mini Digital Speaker1)ROHS,CE,FCC 2)With USB and SD ... stereo headphones plug, USB interface(card reader)Adjust the volume, form: bass volume knob regulationBass unit: 5 inches (131 mm), the ...