Sold a Razor to a guy who makes some real nice tires and he said I needed to include this warning about my machines
WARNING!!!! This device may be habit forming. May cause unexpected acceleration, severely reduced braking distances, blistering cornering speeds, may cause operater to see black and white squares, may cause feelings of grandeur, may cause your cars to be banned, may cause non-users to whine and complain!
Better make your warning label international and add a picture of a happy slot racer to it.
Like the pictures of people putting body parts into machines.....
Put the warning on one of the skull and cross bones stickers. Where I work we ship hazardous materials and our labels have it and they look pretty cool.