... 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 3000WImpedance ... laptop , computer, mp3, mp4, mobile phone(4) High-efficience professional digital vedio amplifier.(5) USB, SD card, FM, remote control, LED display 2.0 ...