Raogoodcx 3.5mm AUX Audio Plug Jack to USB 2.0 Male Charger Cable Adapter Cord for MP3 MP4 High Fidelity. Anti-interference. Good Signal. Stereo Extended. Music Tone Pure and Clean. 3.5 plug of the line connect to the AUX interface of the car , the USB interface Not all the car with this interface can use this kind of line. Some car AUX without decoding function, so can only use MP3 device, (only car AUX interface have the function of read U disk can use this kind of line) Please note: only purchase this from Raogoodcx, we cann't sure other seller' quality, and follow selling other seller is violated amazon policy.