http://cgi.ebay.com/ws/eBayISAPI.dll...740149913&rd=1
I just bought one too..

it has a 3.5mm line out jack.
So just buy a cable where one end is a 3.5mm jack and the other is two rca jacks. http://cgi.ebay.com/ws/eBayISAPI.dll...739100442&rd=1

connect that to the Lineinput on your Headunit in your car and viola.....

I have mine hooked up to the line input off my tv tuner.
I dont use the charging cable since I dont have any USB or firewire ports in my car......