... loudspeaker, for stage, shop, disco and KTV 2) USB loudspeaker with USB, SD, remote, colorful lights USB 2.0 professional loudspeakerOutput(RMS): P.M.P.O ... of audio devices, such as laptop , computer, mp3, mp4, mobile phone(4) High-efficience professional digital vedio amplifier.(5) USB, SD ... :1.big LED screen.2.pro speaker plays with USB, SD card and many kinds of audio devices.3.supporting FM radio4 ...