Principle: The EMP Generator produces a high frequency electromagnetic wave field. An energy saving lamp around the generator induces electromagnetic waves and generates an electric current. Charging: 3 holes are charged separately. Each hole is charged for about 30 minutes one by one. When all three holes are charged, the whole battery is fully charged. When the indicator light of the charger, green light, is off, it means that it is fully charged Notes: Two gears can not be used at the same time or it will get burned Pay attention to the use time: Do not use it for more than 10 seconds each time. Use it for 3 times continuously. Take 20-30 seconds to cool down the instrument. Prevent it from burning out due to high temperature, There is no guarantee that the energy saving lamp will work. If it is on, it proves that the meter is working. Application: The magnetic generator can be used in electronic factories, laboratories, electronic research and development and other factories to test electronic motherboards for anti interference detection experiments Specification: Material: Plastic Size: 85mmx40mmx23mm/3.35inchx1.57inchx0.91inch Package Includes: 1 Set of EMP Generator Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!