Battery Operated USB Rechargeable - The mini handheld fan is operated by batteries and it is rechargeable, you can charge it by computer, laptops or usb chargers, it only takes 3 hours to be fully charged and just need to charge once every three days. Long Battery Life- The small fan built-in 2000mAh batteries, provides 24 hours continuous working. With 5V/1A USB output port, the mini fan can be used to charge your cell phones in emergency. Strong Wind Ultra-quiet Operation- A fan based on the design of uav propeller, the blade structure can effectively improve air efficiency. 2 winds speeds adjustable, strong wind. The fan adopts brushless DC motor, high rotation speed and low noise, the maximum rotate speed is 3400 rpm, the working noise is less than 45db, it will not disturb work and study at all. Soft Blades Auto-stop- The personal fan adopts TPE soft rubber fan blade, when you touch the rotating blade, it will automatically stop, which is safe and healthy. Mini Size Foldable Design- The portable fan is folding, 4.47*1.41*1.45 inch mini size, 4.2 oz lightweight. It can be easily put in your pocket or bag, perfect to be carried for Disney trip and outdoor travel. It is also a good gift for your families, mother, daughter, wife or girlfriend. Cute, tiny and useful summer gadgets for everyone.