Adjustable & Portable3 in 1 + light + user-friendly design, allows it to fold 180 and rotate 360 horizontally,so you can hold it in your hand or put it on the table or even clip it to the edge of the table.Making sure that you can get airflow from different directions, keeping you cool in any angle. It is light and portableLong Time Operation & Fast ChargeThe battery capacity is 4000 mAh, this personal fan can work for 5-20 hours (depending on different speeds) after 5 hours of charging.This is a USB port rechargeable fan, can be charged by a computer, laptop, mobile power, USB charger, mobile phone adapter, car charger, etc.4 Adjustable Speed LevelTo meet different demands for different people and temperatures,the small fan is of 4 wind speeds. You can adjust the appropriate wind speed by pressing the front button repeatedly.Please press and hold the bottom for 3 seconds to turn off the power if you dont use it.Ultra-quiet Design All-copper powerful motor + 7 fan blades + unique airfoil, make it spin more smoothly. So the wind blowing out is more concentrated, more natural, and the noise is smaller than most usb fan. You can keep this by your bedside and sleep comfortably without the noise bothering youUse time: 5-15 hours.Input: 5V/1AService life: 500 times or more