Features: 1. This module is the finished module of transformer for small scientific production. 2. The input voltage is DC 3.7-7.4V and can output high voltage of DC 800-1000KV. 3. According to the tesla coil principle, the module outputs high voltage pulse current, small volume and high efficiency. 4. The peripheral circuit is simple (simply connect the switch and install the battery), the discharge intensity is violent. 5. It can be used as high voltage source for high school science experiment, electronic instrument and anion generator. Specification: Item Size (L*Dia.): 9.1*2.3cm / 3.58*0.90in Input Voltage: 3.7-7.4V Input Current: 4A Input Cable Length: Approx. 10cm/3.94in Output Voltage: 800-1000KV Output Current: 0.5A Output Cable Length: Approx. 16cm/6.30in Discharge Distance between Two Poles: 1.5-2.5cm / 0.59-0.98in Power Supply: 3.7V Li-ion battery, NiCd/NiMH battery pack, 4V or 6V lead-acid battery (Not included) Weight: Approx. 65g / 2.3oz Packing list: 1 * High Voltage Pulse Generator Instruction: The mould is divided into input end and output end. The red and green cable is the input end, and red one is positive, green one is negative. High voltage arcs can be generated by connecting the input end to the battery. Note: 1. Avoid power on when no load. Output ends of cable should be adjusted properly before power on, and the arc distance depends on battery voltage and capacity. 2. The arc distance should be from short to long, do not produce a longest arc at first or the module might be damaged easily. 3. The module has high power and inner heat is not easily dissipated, so it can not work for long time. 4. Less capacity the battery has, lower the output voltage is. It is recommended to use above 2000MA lithium, it is better to choose above 4000MA battery.