Principle: The EMP generator produces electromagnetic waves. An energy-saving lamp is activated by electromagnetic induction, generating an electric current. Charging: Three charging ports are charged separately. Each port requires approximately 30 minutes to charge. When all three ports are charged, the battery is fully charged. When the charger indicator light turns off, the charging process is complete. Note: Do not operate the device in high gear continuously. Allow 2030 seconds between uses to prevent overheating. There is no guarantee that the energy-saving lamp will illuminate; if it does, it indicates proper function. Application: The electromagnetic generator can be used in factories, laboratories, and electronic research and development environments for testing electronic motherboards and conducting anti-interference detection experiments. Specification: Material: Plastic Size: 85mm x 40mm x 23mm / 3.35inch x 1.57inch x 0.91inch Package Includes: 1 Set of EMP Generator (US Plug)