CELL-TECH&reg; 3.5mm Male Aux Audio Jack Plug to USB 2.0 Female Converter Cord Converter Cable This product allows you to play music on your smart portable speaker or car audio system using your U-Disk/USB Flash Drive with MP3 decoder Use for vehicle navigation / car stereo Jack: 3.5mm stereo audio - lets you to connect to your stereo with 3.5mm socket USB Socket: allows you to connect a U-Disk/USB stick to your car stereo and play mp3 files from U-Disk USB Socket is for audio input only