... 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 control3. loudspeaker ... after you place order.Features:1,USB loudspeaker which can read SD and MMC card/U disk2,With simple and nice ...