This high-voltage module uses the principle Tesla coil is made of high-voltage pulse output voltage; Current and small size, high efficiency, simple external circuit (just plug in the switch , the battery can be); High type: Pulse current; Voltage: Input DC 3.6-6V, output DC400kV - 600KV (Please note that when security); High voltage bipolar discharge distance: 10mm-20mm / 0.4-0.8 inch; Output voltage lines length: about 100mm / 3.9 inch; A small production with high-pressure science inverter transformer / booster finished module for high school science experiments , electronic equipment, negative ion generator, high voltage source to use when making small science.