I didn't know that you could buy a Tamiya kit with the radio in the states. All the kits that I have found in the states say that you still need the radio. I was not intending to imply that the kit is somehow illegal or anything like that. But the box DOES clearly state "For use in Japan only". I would assume that they are talking about the charger. I also had no intent on implying that the radio was somehow special or not for use in the US.