The kit is made of boost coils, with professional circuit diagrams, which are convenient for electronic enthusiasts to study. Uses: middle school science experiments, ignition, small science production, etc. When this circuit works, a stable high-frequency arc is generated, which can easily combustibles such as toilet paper, so some people call it a plasma lighter. Precautions for product use: 1. After the kit is made, the input voltage is 3.7V. That is, the voltage of a 18650 battery. 2. The paint on the enameled wire ends of the welding parts needs to be gently scraped off with a blade before welding, please pay attention. 3. The power- of one time is controlled within 5 seconds, and it cannot be powered on for a long time to avoid overheating and burning of the high-voltage package. Circuit board size: 7.3CM x 3.3CM; Input voltage: 3.7V-4.2V, 1 18650 battery Current: 2A; Output voltage: 0.5KV-0.8KV; Output current: +0.4A; High-voltage two-stage ignition distance: less than or equal