Description: This high-voltage generator module is based on the principle of Tesla coil. This small high efficiency module can release high-voltage pulse output with simple external circuit power supply. Ideal for students to study electrical experiment, do science experiment, etc. Input: 3.7V - 7.4V / 4A Output Voltage: 400KV/0.5A Specification: Dimension: 67 x 25mm (LxD) Input Voltage: DC 3.7V - 7.4V Input Current: 4A Input Wire Length: 27cm (Red positive Green negative) Output Voltage: 400KV (Please be careful when using) Output Current: 0.5A Output Wire Length: 18cm Discharge Time: 10s Arc distance/High voltage discharge distance range: 2-4cm Power supply: 1x 3.7V Lithium Battery, 2x 3.7V Lithium Batteries in series(such as 18650 Battery), NiCd/NiMH Batteries, 4V/6V -acid Batteries, etc. (6V battery is Recommended for the best effect) Package Includes: 1 Piece 3.7V to 400KV Power Module Generator Note: 1. The high-voltage module should not be powered on when it is under high voltage no-load status. (Power must be adjusted to a suitable distance to the high-voltage output line, battery capacity and voltage is proportional to the high voltage arc distance) 2.During the experiment, please test the arc distance from short to long, DO NOT exceed the maximum arc distance, or the high voltage energy might not be released and it may easily damage the module. 3. The input voltage will affect the output voltage and Arc distance. 4. The power of the module is large and the heat dissipation inside is weak. Please let the module work intermittently, continuous work no longer than 1 minute. Improper voltage and long working hours may easily damaged the module.