... with all 3.5 audio interface devices : MP3 , 2.for smartphone, smart pad *Chargeable, Enviroment protection. ... professional designer/engineer team for the whole production line, as well as effective and successful QC ... to Ipod,Iphone,Mp3 and most audio devices 2) built-in lithium polymer battery ,recharge through ... Frequency range:90Hz - 20 kHz 5) Output :2 X 2 W6) distortion: 0.3% 1W 1KHz7) Signal to ...