Features: _x000D_ 1. This module is the finished module of transformer for small scientific production. _x000D_ 2. The input voltage is DC 3.7-7.4V and can output high voltage of DC 800-1000KV. _x000D_ 3. According to the tesla coil principle, the module outputs high voltage pulse current, small volume and high efficiency. _x000D_ 4. The peripheral circuit is simple (simply connect the switch and install the battery), the discharge intensity is violent. _x000D_ 5. It can be used as high voltage source for high school science experiment, electronic instrument and anion generator. _x000D_ _x000D_ Specification: _x000D_ Item Size (L*Dia.): 9.1*2.3cm / 3.58*0.90in_x000D_ Input Voltage: 3.7-7.4V_x000D_ Input Current: 4A_x000D_ Input Cable Length: Approx. 10cm/3.94in _x000D_ Output Voltage: 800-1000KV _x000D_ Output Current: 0.5A_x000D_ Output Cable Length: Approx. 16cm/6.30in _x000D_ Discharge Distance between Two Poles: 1.5-2.5cm / 0.59-0.98in _x000D_ Power Supply: 3.7V Li-ion battery, NiCd/NiMH battery pack, 4V or 6V lead-acid battery (Not included) _x000D_ Weight: Approx. 65g / 2.3oz _x000D_ _x000D_ Packing list: _x000D_ 1 * High Voltage Pulse Generator _x000D_ _x000D_ Instruction: _x000D_ 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. _x000D_ _x000D_ Note: _x000D_ 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. _x000D_ 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. _x000D_ 3. The module has high power and inner heat is not easily dissipated, so it can not work for long time. _x000D_ 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.