Usb Fan Silent Powerful: desk fan silent lower than 30db of working sound.High-quality brushless motor with high-precision bearings,streamlined-plume wind blade, reduce the vibration and wind resistance, noise reduction effect of up to 30% One-Finger-Touch Operation & Detachable Mini Desk Fan : desk fan usb, Intelligent touch-button,easy to adjust 3 speed levels. Just to wist the front cover counterclockwise with thumbs of both hands and take it down to clean 2 Power Supply Mode & Convenient Usb Fan: our ,powered by Micro USB and compatible with PC/laptop, power bank, AC adapter and other USB-enabled power supply (3.2ft USB cable); or you can also use it by the battery(Notice:for the safety of the transportation, battery is not included in the product) Powerful USB Desk Fan: inbuilt first-new copper-made brushless motor,support the blades run at high speed,special whirlpool acceleration duct,90% wind power improvement,wind distance up to 10m 360 rotation Portable Fan & Practical Silent Desk Fan : usb desktop fan,provides cooling air circulation in any desired directions with 360 degree tilt rotation.Perfect for office, desktop, dorm, home, bedroom, library, camping, trips