[Upgraded Version] 5-blade brushless motor USB chassis fan: Produces a powerful breeze with lower noise levels (between 20-30dB). Stay cool while making minimal noise so you can work, read, or relax without distractions. [3 Speed Control] The fan with 3 air speed settings can be adjusted to your needs. Comfortable first gear with sound below 20dB, which contributes to sleep; Second speed nature designed for work and study; Cool strong third gear, helps you enjoy outdoor leisure time. [Portable and Compact] Small (12.5x12.5x5cm) and exquisite, easy to put in a bag inside. Weight (0.18 kg), ideal for outdoor activities and travel, or just place it on your desk. [USB Powered] Compatible with 5V output USB devices, such as computers, laptops, power banks, portable chargers and other devices with USB output. [Cools down your summer] (USB fan/Mini fan/Quiet USB fan/USB fan/PC fan usb) gives you a light breeze to keep you cool, it is ideal for office, home, dorm, study, library and leaves little space, which is also good for a restful sleep for the baby.