... 2.3.5mm audio plug ,connects to Ipod 1.black/red colour high end portable notebook USB 2.0 mini speaker, high end portable USB ... , built-in USB control ,sound card decoder ,and the digital power amplifier in one chip3.5mm audio plug ,connects to Ipod, Frequency ... range:90Hz - 20 kHz,Output :2.5W+2.5Wm,distortion: 0. ...