... or U diskPower: 12V(power from the car audio itself,no need external power)Music formats: ... >90dB Distortion:<0.05% Other function:Support AUX audio input(PSP,MP4,PC)Features: Direct Connection with ... WMA decoder Building in Amplifier chips Widely extend external audio sources, like PC, MD, PSP, GPS ... full accessores:usb extend cable, 3.5 line audio cable,usb reader,tool for V.W: Car USB/SD/AUX adapter