An aux-in (or auxiliary-in) socket in your car is a 3.5mm jack into which you can plug anything that has a standard headphone connection. It sends sound to the multimedia system, enabling you to stream music from a device through the cars speakers.

What is AUX mode in radio?

An auxiliary port (AUX) literally just means an additional audio input method. It is an asynchronous serial port with an interface that allows the auxiliary input of audio signals for: MP3 players. Headphones. Portable music players.