POWERFUL WIND&3 ADJUSTABLE SPEEDS --The wind speeds of the first, second and third gears of USB fan are 3.9m / s, 4.9m / s, 5.9m / s. The strong wind will make you feel cool again in the hot summer,you can also adjust the wind according to yourneeds. LOW NOISE&SWEET GIFT--The minimum volume (Speed 1) of the desk fan is 25db, and the maximum volume (Speed 3) is 45db.This Mini Fan will not disturb you to sleep or study.We have prepared a small gift for each customer: mini mobile phone fan, I hopeyou like it 360RORATION&2000mAh BATTERY:The fan can rotate 360vertically, you can set the fan angle according to your needs.In addition, the fan has a built-in 2000mAh battery, and you can use it for up to 7 hours without a USB cable.It can be chargedwith power bank, computer host, adapter, etc. MINI SIZE& FAN:The size of the MINI fan is 13.5 * 13.5 * 5CM, it can be easily put into the bag when going out, very suitable for going out, traveling, etc. (it can be used for up to 7 hours after being charged). The portable fan is an indispensable item in summerThe three wind speeds are:3.9m/s,4.9m/s,5.9m/s,far exceeding other fans.This little fan will bring you different feeling in summer! Blue Mini Size:13.5*13.5*5CM 3 Adjustable Speeds 360 Vertical Rotation 2000mAh Battery Dual Power Supply (USB & battery) Multi-Scenario Use (office, home, library) Strongest windspeed:5.9m/s