LEGO Power Functions
LEGO Power Functions is an electrical construction system from LEGO. It consists of battery holders for supplying power, different types of engines to make things move, to give light, remote control and even connection to a computer. Everything fits together in one system so you can build and operate your own inventions. The Power Functions system has 4 wires instead of the 2 wires of the 9V system. This offers you a range of options, which were not available with the 9V system. Remote control functions, sensors and intelligent control can now be used in the Power Functions system.