USB Fan duct length is 20 cm / 7.87 inches and can be bent to any angle and height you want. Gently adjust the flexible neck to position the cool breeze anywhere you wish. | Portable USB fans are compatible with all USB (A) output devices, plug and play, ideal for desktops and laptops, simply plug into any USB port on your laptop or PC, and no driver installation is required. | The mini cool fan has a built-in brushless motor, small but powerful, and you can feel the cool breeze at a distance of 1.5 meters, which is the best choice for you in the hot summer. The one-touch control switch is very easy to use, so you don't have to unplug the fan when it's not in use. | The personal fan is small and lightweight, easy to carry, brings you a cool breeze anytime, anywhere, and can be used at home, office, school, airplane, elevator, queue, commuting, and anywhere there is a USB port. | Customer satisfaction is one of our top priorities, if you have any questions about these portable usb fans, please contact us for after-sales service. （Please disconnect the fan when no one is around！