... product like : MP3 ,Computer ,mobile phone ,CD player etc, Protable mini boom speaker- Teeny Tweakers -Tiny pocket size with room filling ... -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: 0.3% 1W 1KHz3.connects to Ipod ...