NOTE Please note: Charging time: Charging time: must be within 4 hours. Remember not to charge for too long. Use the fan in accordance with these standards. If you do not operate in accordance with this standard, you will be held responsible for the loss of customers. Wireless Rechargeable: Mini portable USB fan can be built in a rechargeable 18650 battery, also can be powered by USB cable and rechargeable battery. Comes with a rechargeable battery, cable; can also connect power bank, used anytime. Foldable hand fan: Portable battery fan has stepless speed control helps you choose the appropriate wind speed you want. The foldable handle allows you to use it as a table/desk fan, and easily put it in your bag, so you can take it anywhere. Enjoy cooling anywhere: Handheld USB and battery powered fan suitable for room office work travel hiking climbing camping exercise sports or watching games; mini personal fan will be your best friend in summer. Adjustable Wind Speed: Personal Fan USB Battery Powered Control Switch has 3 settings, low/medium/high speed level.