The high-voltage module is designed based on the principle of a Tesla coil and generates high-voltage pulse output. It features a compact size, high efficiency, and a simple peripheral circuitonly requiring a switch and battery to operate. The discharge performance is strong. This 20kV boost module operates with a power supply such as a single 3.7V lithium battery or two in series, including 18650 batteries or recycled mobile phone batteries (protection board must be removed; battery capacity above 2000mAh is recommended). The arc generator has an input voltage range of DC 3.66V and delivers a DC 20,000V high-voltage output. Wiring instructions: input sidered wire for positive, green wire for negative; output sidesame color wires on the opposite end. This 20kV boost module is suitable for high school science experiments, electronic devices, negative ion generators, high-voltage power sources, and small-scale educational projects. Avoid operating the high-voltage module without a load. Ensure the power input is properly matched to the high-voltage output requirements. The battery capacity directly affects the arc distance and performance. Optimal results require sufficient current supply, not just maximum voltage. Color: Black Material: Metal Package Contents: 3 x High Voltage Transformers Note: Lighting conditions and display settings may cause slight variations in the color shown in images. Measurement may vary by +/- 13 cm.