What is an Auxiliary audio input?
It's a line level input that accepts audio source signals such
as those from an mp3 player, iPod iPhone, or any portable audio
source etc so that you can hear them.
hardware to hardware in. plug one end into the aux jack on the
Oem stereo, and the other into the portable audio device and you'll
get way better sound quality than if using an FM transmitter,
auxiliary interfaces are not tape adapters FM transmitters or FM
modulator, there is nothing wireless about them, that means the
signal isn't getting degraded by the process of sending it to your
car radio