Portable usb mini music speaker with ipod dock 1.With fm radio,usb,sd card 2.For mp3, ... 4.Mini&portable Portable usb mini music speaker with ipod dock Frequency response 150HZ-20KHZOutput(RMS) 3W*2SNR95dBTHD10(%) Impedance 4(Ω)Power ... service for you! Portable usb mini music speaker with ipod dock