Dux I'm afraid it is proportional and the coin there is 1 cent
the transmitter and receiver(including servo controller to use a normal rc servo and a speed controller included) will be available in dezember or next year it will cost minimum 60 euro!
Other parts receivers, controller with lighting, akkus, mikro motors from 4-12mm ,gears and they also build your dream car
but be carefull the prices are from 350€ to... they also want to build a standart modell series in february 2003.
The link of that shop is
www.mikroantriebe.de/
yes boys its a one cent coin it uses only 1 cell with 1.2Volts it is transformed to 3.3 volts by a elektronik