Controlling your iPad or iPhone in your car with a normal FM transmitter can be a pain in the butt. Controlling them through a device that plugs them into the AUX port on your car isn't any better typically. The problem is that you have to look down to skip tracks and taking your eyes off the road isn’t a good thing.
Monster has unveiled a new car adapter that connects the iPhone or iPad to the car via an aux input and a 3.5mm cord. The cool part is instead of having to look at the iPhone to control the thing; you can control it with hand gestures. The car adapter is called the Monster iMotion CarPlay 3000.
Once connected you can swipe your hand from left to right to skip forward and from right to left to go backwards. The only downside I see is that the usefulness of the device might not be as good for everyone depending on where the aux input and DC outlet are.