3 Speed Adjustable: 3-speed setting allows you to choose the comfortable speed on different occasions. You can press the button repeatedly on the back of the desk fan to switch from low, medium high to off. Low level: 1500rpm/ 2m/s, soft and quiet; Medium level: 2070rpm/ 2.9m/s, powerful; High level: 2616rpm/ 3.7m/s, more powerful.360Rotation & Stable: The fan head of this electric fan can be rotated 360 degree vertically to provide the wind in any desired direction to quickly cool you down. Designed 4 rubbers on the bottom of the personal fan help reduce vibration and increase friction, which keep it more stable and prevent sliding when working even at the high speed.USB Powered: The portable fan is powered by 5ft USB cable(non-detachable) and can be plugged into any equipment with a USB port, such as PC/laptop, power bank, USB wall charger(not included), car charger and any other USB-enabled power supply. you can simply plug it into the power supply for the whole day or night working. (Note:This fan not include battery)Removable Front Cover: The front cover of desk fan is removable. When you feel the need to clean the fan, you can wist the front cover counterclockwise with your thumbs of both hands and take it down to wipe off the dust. Then align the groove and turn it clockwise to reinstall. Once the cover is tightened, it will not loosen easily, ensuring your safety while using.Compact Size & Application: This is a 5.5 inch mini fan, total measures 14*14*5 cm (5.5 * 5.5 * 2), lightweight and space-saving. The portable fans is perfect for office, desktop, dorm, home, bedroom, library, camping, trips or anywhere you need to make your day cool. The noise less than 50 dB provides you with quiet enjoyment.