"400kv boost step up power module with 2 line output input high-voltage transformer generator uses the principle tesla coil is made of high-voltage pulse output voltage, this module is a small production with high-pressure science inverter transformer / booster finished module, the input terminal dc3v-7.2v voltage can get 200,000 volts for dc high voltage ( about 1-2cm arc ) at the output can be used as high school science experiments, electronic equipment, negative ion generator, high voltage source to use when making small science. About power: 3.7v li-ion battery can be used single or two series, such as 18650, idle cell phone batteries ( to remove the for protection board, the proposed capacity of 2000mah or more ) or nicd / nimh battery pack, 4v or 6v lead acid batteries, input power cable length: About 10mm (red is positive), dimensions: A¦24 x 63mm please note: Avoid high-pressure high-voltage module load electricity use. Must adjust the high voltage side suitable distance (before electricity, battery voltage and capacity is proportional to the distance from high-voltage arcing used when testing the arc distance from short to long experiment, prohibited from beyond the arc when powered up, the energy can not be released due to high pressure, easily damage the module). Power: 3.7V Li-ion battery can be used single or two series such as 18650 idle cell phone batteries ( to remove the protection board the proposed capacity of 2000mAh or more ) or NiCd / NiMH battery pack 4V or 6V lead acid batteries. This is a high voltage step-up power supply module, which is commonly used in electronics experiments and demonstrations. The module can generate a voltage of up-to 1000KV from an input of 3-6V from a normal Li-ion battery.