Specifications: This high voltage module uses Tesla coil principle, output high voltage pulse and high voltage current. It has small size, high efficiency, the external circuit is simple(just plug in the switch and battery), high intensity of discharge. About Power: 3.7V li-ion battery can be used single or two series, such as 18650, idle cell phone batteries ( to remove the for protection board, the proposed capacity of 2000mAh or more ) or NiCd / NiMH battery pack, 4V or 6V lead acid batteries. This module input DC 3V-7.2V voltage, can output about DC200,000V voltage(about 1-2 cm arc), can be used for school science experiment, electronic equipment, negative ion generator, scientific small production. Uses: Commonly used in 105 high-voltage generator, high voltage ignition, teaching experiments. Type: Step-up Power Module Voltage: Input DC 3.6-6V, Output DC 400-600KV High Type: Pulse Current High Voltage Bipolar Discharge Distance: 10mm-20mm Size(Diameter x Length): 24mm x 65mm/0.94"" x 2.56"" (Approx.) Max Diameter: 24mm/0.94"", Min Diameter: 22mm/0.87"" (Approx.) Notes: Due to differences in lighting and screen settings, the color of the project may be slightly different from the picture. Due to different manual measurements, allow for slight size differences. The module should not be used in the high voltage no-load state. Due to the high power, the internal heat is not easy to diffuse, every power-on time should be controlled within a minute. The way to determine whether the battery capacity can be driven to the maximum output power, is to measure the battery voltage in arcing stage, if the voltage is about 6V, it can output the maximum power. Two sections of small capacity lithium batteries' voltage is 7.2V, the voltage is about 4V in the arcing state, the smaller capacity, the smaller voltage, so it is recommended to use lithium battery more than 2000mA, if conditions permit, 4000mA lithium battery is the best choice. Package Includes: 1 x Boost Step-up Power Module