The newest Tesla tops out at 6mph. That's not a mistake: The company has teamed up with the wagon-makers of Radio Flyer to create a battery-powered Model S for kids, reports ABC News. If parents think 6mph is too fast, they can cap it at 3mph. The basic model sells for $499 here and begins shipping in May, but this being a Tesla, all kinds of upgrades are available. Indoor car cover? Check. "Silver Turbine Wheels"? Sure, why not. Those who indulge in all the extras will wind up paying about $800, notes TechCrunch. (More Tesla stories.)