Features: Unique and stylish structure. Small and exquisite. Easy to carry. 3 level of adjustable wind control intelligent control, simple operation. Stable, durable and reliable. Power in two ways: 18650 lithium-ion battery or USB DC 5 v. usb output dc 5 v for charging devices such as mobile phone. High efficiency and low consumption, energy saving and environmental protection. Technical specifications: Output Power: 4.5 W (max) Input voltage: 5 v dc 1a Output voltage: 5 v dc 1a Charging time: ca. 5 hr