1,Support MP3,MP4,CD ,mobile,USB drever MP3,MP4,ipod,computer 2,Manufacture of factory ... sound4. Ideal for portable iPod, mini iPod,CD players etc 5,Support SD/MCC card ,mobile,USB drever MP3,MP4,ipod,computer6 ... -18KHzInpendence:4 ΩPowerd by DC6.0V or(4ΧAAA batteries) mini speaker