HANDS FREE DESIGN: Unique headphone design, perfect for hands-free hands. The double-headed neck fan is also equipped with a 7 colors LED light. Rainbow lights are cool at night and are ideal for night runners 3 Speed & 360 Rotation: The 3-speed adjustable USB fan can adjust the most comfortable winds as you like. With a unique curved design, the two mini fan heads can be rotated 360 degrees, allowing you to enjoy the cool wind from any angle Long working time and USB charging: Built-in 2000mAh lithium battery, our portable fan can be repeatedly charged via USB charging cable. Depending on the air volume, it can be used for about 3 to 8 hours. If the battery is exhausted, you can charge the battery at any time. Because it is compatible with most computers, laptops, mobile power, and other devices with USB output Wide application: lightweight, small personal cooling fan for easy carrying and storage, hanging design, hands-free necklace fan perfect for outdoor sports, gym, office, travel, camping and reading