FYL 3.5mm Male AUX Audio Plug Jack to USB 2.0 Female Converter Cable Cord EN This Tekit cable allows you to play music on your car audio system using your U-Disk/USB Flash Drive with MP3 decoder Please make sure your Aux port has mp3 decode function that can read the mp3 file from U-disk.If your car don't have this function,it will can't work,PLS CONFIRM IT BEFORE YOU BUY!!! U disk capacity as far as possible not too large.It depend on the car's AUX audio interface can support how much capacity This Tekit aux cable only support MP3 Music Format,and don't make file in your U-DISK and don't store other documents. Only support the U-DISK,can't charge for your phone or other device!