4 Speeds 90 Angle AdjustableThis portable fan with Acsergery 4 adjustable speed is adequate for your various demand, just press the power button to change the speed.90 Angle Adjustable fan can satisfying your different needs under multiple occasions. . Long Working TimeThis desk fan built-in 4000mAh rechargeable battery. Work up to 4-14 hours (depending on its speed). Comes with Acsergery USB cable, the USB fan compatible with Acsergery any device with Acsergery USB port (laptop, desktop, power bank, socket, power outlet) to get charged. . Quiet Design Four non-slip mats on the bottom help reduce vibration to make the working sound lower, and increase friction to preventing the fan moving around even when working at the high speed.. . Portable desk Fan 13.8* 7.5 * 18.3 cm little size and 0.4kg lightweight. This battery fan is easy to pack in a bag when you travel or go out. It will be a good partner for desktop, office, home, dormitory, camping, library or any activity. . Easy to cleanDesigned with Acsergery detachable front cover, very convenient to clean after long-time use. High density grille cover design, The distance of the front grille cover is only 4 mm and back grille cover is 7 mm, even childrens fingers are not easy to reach. It is very important to assure childrens security. .