FC1 100 Wind Speed Levels Summer Cooler Desktop Fan Turbine Handheld Fan 1.Inspired by the turbine, according to the fluid dynamics, the air is rotated and compressed to bring cool and soft wind 2.The rotating speed is fast enough to stir the airflow with a larger angle and area, turning it into a spiral wind flow, and outputting stronger wind 3.Portable size and light in weight, easy to carry and convenient to put into your bag 4.Almost noiseless when operating, quiet and relaxing 5.Up to 100 wind speed gears for easy adjustment, meet different needs 6.Built-in 4000mAh large battery capacity for long-lasting use time 7.It's rechargeable by the included cable, easy to charge it via connection with your laptop, power bank, wall charger, etc 8.The sturdy bottom design makes it easy to use on the desk Specifications: 1.Product material: ABS Electronic componentshardware 2.Wind speed gear: 1-100 gears 3.Product size: 62*60*170mm 4.battery capacity: 4000mAh 18650 battery 5.Charging input: DC 5V1A 6.Working power: 0.9-6W 7.Working current: less-than 1A 8.Working hours: 1.5-11 hours