How to play music from my Iphone 3gs through my car's speaker?

My car only has a CD player and nothing else. So I was wondering if there's a device that connects to the power outlet of the car and to an iphone to play the music through the car speakers? Does this device exist?

I don't believe that there's a device for your cigarette lighter but there's a a hole in including in alot the newer cars called the auxilary hole. You can pic one up from Radio shack or Walmart and you can use the auxillary cord to plug one side in your Iphone or Mp3 player and the other to your car. If you don't have one, you would have to get a new radio for your car with an auxillary hook up.

You need and auxiliary audio input interface, or an iPhone adapter
the device is not universal it needs to be made for your vehicle model and brand

http://www.oemautosound.com/c-20-auxiliary-input.aspx

http://www.oemautosound.com/c-19-car-ipod-interface.aspx

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