You have the very good stereo sound
The I Phone audio jack plugs into an FM transmitter that sends the signal to the vehicle FM radio that plays the stereo signal.
The transmitter device is powered by the 12 volt onboard system (cigarette lighter) and is very small.
My son handed me down his old one and I use it to listen to audio books as I travel the Interstates for my job
Ah, thanks.
I was thinking the crappy cell phone speaker...