... speaker, high end portable USB Mini speaker for mp3/mp4/iphone, Mini USB speaker ,Work with all ... source with 3.5 audio interface product like : MP3 ,Computer ,mobile phone ,CD player etc, Protable ... card decoder ,and the digital power amplifier in one chip3.5mm audio plug ,connects to Ipod, Frequency ... 3% 1W 1KHz 3.connects to Ipod,Iphone,Mp3 and most audio devices4.built-in lithium polymer battery ...