The structure?consists of?a?black?wooden box.?Inside, there is a high-voltage electric circuit.?In the?front, there are poles?for?gas - filled tube.?The?pole?is about?1.5 inches?deep from?the wood and has a hole to see the spark needle?? At the back, there is an on/off button, the fuse is connected to the electrical?plug which can be connected to?220 V. AC 50 Hz.