... speaker,good qualiy,fashion,portable. 2.Universal 3.5mm audio interface. 3.Support for multimedia players.4.USB power,perfect ... play, identify USB automatically, USB Powered and signal directly3.Full-digital processing, no signal lose by USB transmission, high efficiency, ... circuit needed, easy to operate6.Support for laptop, desktop, MP3, MP4, tape recorders, learning machines, radios and other audio ...