The structure of these fans is unique and fashionable. It’s available in 2 colors & has 3-mode of wind speed. German brushless DC motor,100% bare copper to ensure the high winds and long-life. An intelligent control system, reliable performance, which is fully functional and easy operation. Using the international standard 18650 lithium 2200mAh Capacity batteries, that can be recycled and low cost, more universal. A professional portable fan with the integration of design, simple appearance and solid structure. Note: The wind is weak when fan without lithium battery installed but connect to a power cable. Specifications Colors: Depend on availability LED Indicator: Yes Battery Type: 18650 Lithium Rechargeable 2200mAh Capacity Battery Output air volume: 1-Speed 873 L/Min (work time about 2 hours) 2-Speed 459 L/Min (work time about 4 hours) 3-Speed 242 L/Min (work time about 8 hours) Output power: 4.5 W (Max) Battery: 18650 Lithium-ion battery Charger: Input: 100-240V AC Output: 5V 1A DC Charging time: about 4-5 hours Fan Charged Method: Micro USB Cable connects to USB Port of PC/notebook etc, or by power adapter.