Please check the pictures carefully. This only works with older iPods/iPhones that have the 30 pin adapter.
If you have one of those, then use this to wirelessly play through your car radio. All sorts of pieces so you can configure for your setup. Note: this will not charge your device while you are playing it. But most of those devices would allow you to use for an entire day without charging. So you should be able to use on a full day roadtrip and not have to worry.