USB Car Chargers Adapter + AUX? - 1

Http://www.amazon.com/Ecomgear-Universal-Charger-Adapter-Connector/dp/B00499DZP0/
Something like this…
There are many different brands. But does the aux side of this work with cars that don't have the aux input, or is the only way you can listen to music is through the aux? Can you listen to music by having it plugged into the usb?

And if not, I'm looking for something that can be used to listen to iphone music in a car without an aux input already in the car, but not an FM transmitter or a cassette tape adapter.

If the car does not have a factory installed aux jack for audio, you will have to replace the head unit (car stereo unit) with one that has either a usb or aux jack input.FM transmitters suck in my opinion. The audio is not really clear.

I replaced the factory head unit in my car with a head unit with CD player that plays all formats (WMA, MP3 etc)… It also has an aux jack to use to plug in your ipod/iphone/itouch via a 3.5mm double male audio jack cable…