... ,connects to Ipod 1.high end portable USB Mini speaker for mp3/mp4/iphone, Mini USB speaker ,Work with all sound source ... with 3.5 audio interface product like : MP3 ,Computer ,mobile phone ,CD player etc, Protable mini boom speaker ... ,distortion: 0.3% 1W 1KHz 3.connects to Ipod,Iphone,Mp3 and most audio devices4.built-in lithium polymer battery ,recharge ...