... mobile phone.(4) High-efficience professional digital vedio amplifier.(5) USB, SD card, FM, remote control, LED display 5.1 powered speaker ... .Description:1. 5.1 acoustics system with built-in USB and SD card reader, read MP3 music format2. volume, bass, treble, front, ... other audio input4. surround sound 5.1 powered speaker with USB, SD card, FM, remote control5. fashionable and good sound effect 5 ...