hm.. LOL ! Although it's not itself a "car gadget" i couldn't help myself posting about this toy
It works on a simple principle : conected via bluetooth , the car moves as you want it to. Keys ? Joystick, keypad or volume keys. I'd play all day... come to think of it, i always have been a remote control car maniac now...how cool is that?
Range : up to 10metres
Speed : unknown