Specifications No-load speed - 130,000 rpmWind speed - 52 meters/secondWorking voltage - 5.5V-9VCharging time - >2.5h Charging voltage - DC5v 1A Maximum power - 100W Number of wings - 13High temperature protection - 150℃ Built-in 2 batteries - 18650 4000MAh Features Powerful power and efficient performance Built-in 2 high-performance batteries, 8000mAh large capacity, level 1 can be used for 4 hours, durable, equipped with USB data cable, convenient charging. The maximum speed is about 130,000 RPM, the peak wind speed is more than 52 m/s, and the strong performance is suitable for various dust removal scenarios. Quiet design and comfortable experience Using large size precision machining numerical control technology, quiet operation, provide strong airflow at the same time, enjoy a fresh breeze without noise. Convenient operation and flexible use With stepless speed regulation function, the speed can be easily adjusted, and the three levels of slow can be selected to meet different needs and customize the required blowing speed. Compact, easy to carry, suitable for outdoor use, anytime, anywhere to enjoy the strong wind. Security and reliable use Equipped with a 30A electronic speed controller to effectively manage heat and deliver 100W maximum power, safe and reliable, experience powerful and efficient performance without sacrificing safety and comfort. Warranty period We have a 3-month warranty. During this period, if there are any quality problems, you can contact me and we will return the goods. Package Included 1*Powerful fan2*Nozzle1*usb cable