... shop, disco and KTV 2) USB loudspeaker with USB, SD, remote, colorful lights USB 2.0 professional loudspeakerOutput(RMS): P ... (4) High-efficience professional digital vedio amplifier.(5) USB, SD card, FM, remote control, LED display 2.0 professional ... voluminous bass. Description:1. loudspeaker with built-in USB and SD card reader, read MP3 music format2. volume, bass, treble control3. loudspeaker ...