... 3.portable,nice design 4.best quality & competitive price Functional Computer Mini Speaker With USB/SD Card Reader: 1.Stereo sound ... and amplifer circuit needed, easy to operate5.Support for laptop, desktop, MP3, MP4, tape recorders, learning machines, radios and other audio ... disassemble JMDYX-0111.Connect USB socket of this unit to computer or the USB socket of charger for battery recharging 2 ...