The high-voltage module is made by using the coil principle, and outputs high-voltage pulse high-voltage current, small volume, high efficiency, simple peripheral circuit (just need to connect the switch, the battery can be) the discharge intensity is . About 20kv boost power module the power supply: you can use a single 3.7V lithium battery or two series, such as , idle mobile phone battery (to remove the protection board, recommended capacity above 2000mAh). The input voltage of the arc generator is dc 3.6-6V and output dc 20000v high voltage, input wiring: red - positive; green - negative; output wiring: the other side same color cable. 20kv boost module can be used as high-school scientific experiments, electronic devices, negative- generator, high-voltage source, to use when small science. The high-voltage module should avoid the use of high-voltage current without a load. Power must be set to a suitable distance to the high voltage output line, the battery capacity is proportional to the distance and the use of the high pressure arc (not a voltage as high as possible, must sufficient current). Colour:black Material:Metal Package Contents: 3 x high voltage transformer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.