Hands-Free Design：Helmet with unique design, perfect for freeing your hands. The double-headed fan is also equipped with a 7-color LED light. Rainbow lights are cool after dark and are perfect for night runners. 3 speeds and 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, so you can enjoy the cool wind from any angle Long running time and USB charging：battery at the Built-in 2000mAh lithium, our portable fan can be charged repeatedly via the USB charging cable. Depending on the air volume, it can be used for about 3-8 hours. If the battery is exhausted, you can charge it 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 neck fan, ideal for outdoor sports, gym, office, travel, camping and reading