High Fidelity. Anti-interference. Good Signal. Stereo Extended. Music Tone Pure and Clean. The 3.5mm plug connects to the AUX interface of the car, and the USB interface connects to the USB flash drive. Supports auto-play of USB flash drive. Not all cars with an AUX interface can use this cable. Some car AUX inputs lack decoding functionality and require an MP3 device. Only cars with AUX interfaces that support reading USB drives can use this cable. When using, it is recommended not to store too many files on the USB drive, as compatibility may vary by car. The USB drive should contain only MP3 format files, with no additional documents or folders. Category: Audio Cable Connector: 3.5mm Male to USB 2.0 Male Length: 21cm Color: Black Material: Plastic + Metal Package Includes: 1 x 3.5mm AUX Audio Plug to USB 2.0 Male Converter Cable Note: Light and display settings may cause slight color differences between the image and the actual item. Measurement allows an error of +/- 1-3cm.