Features It can be used as a high voltage source for high school science experiment, electronic instrument and anion generator. This module is the finished transformer module for small scientific production. The input voltage is 3.7-7.4V DC and can produce high voltage of 800-1000KV DC. The peripheral circuit is simple (just plug in the switch and install the battery), the intensity of the discharge is violent. According to the principle of tesla coil, the module produces high voltage pulse current, small volume and high efficiency. Specification: Item Size(L*Dia. ): 9.1 x 2.3 cm/3.58 x 0.90 inches. Input voltage: 3.7-7.4 V. Input current: 4A Input cable length: approx. 10 cm/3.94 inches. Output Voltage: 800-1000KV Output current: 0.5A. Output cable length: approx. 16 cm/6.30 inches. Discharge Distance between two poles: 1.5-2.5cm/0.59-0.98in Power supply: 3.7V Li-ion battery, NiCd/NiMH battery, 4V or 6V lead-acid battery (not included) Weight: approx. 65 g/2.3 oz. Package list: 1 x high voltage pulse generator. Instruction: The mold is divided into inlet end and outlet end. The red and green cable is the input end, and the red is positive, the green is negative. High voltage arcs can be generated by connecting the input end to the battery. Note: 1. Avoid powering on when there is no charge. Output ends of the cable must be adjusted properly before power on, and the distance of the arc depends on voltage and battery capacity. 2. The arc distance should be from short to long, does not produce the longest arc at the beginning or the module could be easily damaged. 3. The module has high power, and the indoor heat is not easily dissipated, so it cannot work for a long time. 4. Less battery capacity, lower the output voltage is. It is recommended to use above 2000MA li-ion, it is better to choose a 4000MA battery above. Package List