... bass 2.0 pro loudspeaker(3) professional loudspeaker with USB, SD card, FM, remote control, LED display(4) loudspeaker adapt ... phone(4) High-efficience professional digital vedio amplifier.(5) USB, SD card, FM, remote control, LED display 2.0 professional loudspeaker ... , voluminous bass. Description:1. loudspeaker with built-in USB and SD card reader, read MP3 music format2. volume, bass, treble ...