This model is used for study lightning, electrical sparkling from conductive wires. They connect to the tranformer for increase the voltage then the voltage is high enough, the electron will jump between the narrow wire. The wire is made from metal and 60 cm in length. The Bottom of the wires is forced narrow 1 cm and widen to the top. The widest is 8 cm and must use the voltage 7,000 Volt. It has the switch to control working. This model shows clearly the sparkling begin at the bottom and up to the top. It sets on roller base and easily to move. The three side walls are made from transparent mirror.