Koolertron QL-AMI01 USB Cable for Select Audi Music Interface Models Power supply: 12V,Frequency: 20Hz to 20kHz, 2dB Format:MP3 bit rate: 8 to 320Kbps (including CBR, ABR, VBR) ;WMA bit rate: 8 to 320Kbps (including CBR, VBR) Power consumption: ?1W THD: 0.05% ;S/N ratio: 90dB For Audi A4 S4 A5 S5 Q5 A6 S8 A8 or Q7 Audi Music Interface