Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I had one of those. Dont waste your money. It would work on and off and is very flimsy. Mine lasted 2 weeks. Get the off brand from walmart. It comes with wall unit, car unit and cable for $14.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.