?Adjustable Powerful 4 Speeds? Notes : 1. Long press the button to enter the highest setting (Speed 4). 2. The highest setting will only work when the output current up to 2A. With low/medium/high/super wind speed level , this variable speed design provides you more choices in different temperature environments. | ?Super Quiet ? Although the fan is very strong, even in high speed the noise is less than 50dB. It is a quiet and good friend when working and sleeping. Ideal for your desk, office bedroom use. | ?Powered by USB? No battery included, powered by a 4.9ft USB cable, compatible with computers, laptops, power banks, wall chargers and any other USB-enabled power supply. USB fan is very energy-saving and environmentally friendly. | ?Adjustable & Easy to Clean? Fan head is able to tilt from 0 to 90 degree to direct the airflow to where you want. Removable front cover is easy to remove for cleaning the fan blade. | ?Small but Powerful? 5.5 Inch blade and 6.5 inch frame. Compared with the old version USB metal fan, this fan pushes packs a huge punch and cools you down quickly.Don't look it down because of its small appearance. You will surprise by how super strong the airflow is.