The end of a cassette tape plugs into the USB port. The rewind button plugs into the Aux jack. You can get a good look at both in the demo after the break.

But you can also get something like this JMOX USB-C to 3.5mm Audio Aux Jack Cable, which ends in the protruding, male connector. This is designed for plugging directly into your car's auxillery 3 ...

The analog AUX jack enables any music player to play back through the vehicle's speakers, while the USB port allows music, metadata and playlists to be transferred between iPods and other digital ...