That is a website where you can see a short video of how this works.
It says that it works with all phones, and it's much easier than trying to keep a headset/bluetooth in your ear.
And if you live in a no-phone-in-car state like I do, you can't possibly get into trouble. (I was pulled over the other day because the cop THOUGHT I was oh the phone! I was just singing w/ the radio! LOL)