4 Speed Choices & 90 Degree Variable Tilt Head COOPA desk fan offers natural wind, sleep wind, neutral wind, and strong wind with four wind speeds, giving you more options in different temperature environments. The desk fan features a 90 degree tilting head to customize the airflow angle. You can tilt and adjust the desk fan head in any direction. 12H Working Time & Cordless Use The USB desk fan uses an upgraded 4000mAh battery. This desk fan can operate for 3.5 to 12 hours when fully charged. It is suitable for office or home use, as well as outdoor activities. The desk fan can be used without being plugged in, making it a practical device for both indoor and outdoor use during hot summer days. It can also be used while charging. Removable Fan Cover & Durable Battery The removable front cover of the personal fan makes cleaning easier. The personal mini fan meets international voltage requirements and includes a built-in optimized PCB chip that provides charge and discharge protection, overheating protection, and other safety features to ensure battery life and prevent short circuits. Super Quiet & USB Connected Our quiet desk fan can be charged via any USB power source such as a power bank, laptop, desktop, adapter, or wall charger. The copper brushless high-speed low-noise motor design makes this portable fan ultra-quiet, so it wont interfere with your work, study, sleep, or yoga. Portable & Safe The mini desk fan measures 13.8 x 7.5 x 18.3 cm and weighs only 296g. The high-density grille cover has a front spacing of only 4mm and a rear spacing of 7mm, making it difficult for childrens fingers to reach, which enhances safety.