HAND FREE DESIGN: Unique headphone design, perfect to release your hands. The double-headed neck fan is also equipped with a 7-color LED light. The rainbow lights are cool at night 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 WORKING TIME&USB RECHARGING: Built-in 2000mAh lithium battery, our portable fan can be repeatedly charged through the 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 neckband fan ideal for outdoor sports, gym, office, travel, camping and reading | 100% RISK FREE PURCHASE: We offer a 30 days no reason to exchange or return and 1 year quality guarantee,if you don’t like our mini fan,please don’t hesitate to contact us before you leave a negative comment,we will solve the problem for you within 24 hours