Use: Home Theatre, Portable Audio Player, Mobil... Channels: 6 (5.1) Special Feature ... of audio devices, such as laptop , computer, mp3, mp4, mobile phone.(4) High-efficience professional digital vedio ... with built-in USB and SD card reader, read MP3 music format2. volume, bass, treble, front, rear ... . adapt to computer, laptop, DVD, VCD, CD, MP3, TV, mobile phone and other audio input4. surround sound ...