... nice design 4.best quality & competitive price Home Portable Laptop Speaker With Replaceble Battery: 1.Stereo sound effect, wonderful bass, sound beyond ... driver and amplifer circuit needed, easy to operate5.Support for laptop, desktop, MP3, MP4, tape recorders, learning machines, radios and ... unit to computer or the USB socket of charger for battery recharging 2.Can play MP3/WMA music fromat audio ...