Features:- Two gears can not be used at the same time or it will get burned- 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- 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 temperaturePrinciple: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. When the electric energy is sufficient, the bulb will light up.PS: There is no guarantee that the energy-saving lamp will work. If it is on, it proves that the meter is working.Specification:- Frequency: 150MHZ- Typical applications: Fingerprint lock, slot machines, claw cranes, game machines, etc.- Working voltage: DC 36V- Antenna mode: built-in reinforced antenna + external high-frequency antenn- Power supply voltage: DC 36V- Charging time: 1.5 hours in total- Charger: input110-220 VAC- Built-in rechargeable battery Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it