... 2.0 mini portable speaker for your notebook ,computer ,mp3,mp4,computer,laptop ,OME color Specification 1.RMS:2.5Watts ... automatically, USB Powered and signal directly3.Full-digital processing, no signal lose by USB transmission, high efficiency, high performance ... amplifer circuit needed, easy to operate6.Support for laptop, desktop, MP3, MP4, tape recorders, learning machines, radios and other audio ...