A. Upgraded version - 5-blade USB case fan and brushless motor create powerful wind with lower noise level (20 to 30 dB). Keep cool and make minimal noise so you can work, read or relax without distraction. B. 3-speed wind - The fan with 3 airflow speed settings can be adjusted according to your needs. Comfortable first speed with noise level less than 20 dB, so it is conducive to sleep; second speed is for work and study; cool, powerful third speed allows you to enjoy outdoor leisure. One switch simplifies control. C. USB powered - With 1.2 m long USB cable, compatible with 5V USB devices such as computers, laptops, power banks, portable chargers and other devices with USB output. D. Adjustable angle - The fan frame can be rotated 360 degrees, making it very flexible. You can adjust the fan's tilt up and down as needed to enjoy the cool breeze. It is very convenient no matter where you are. E. Mini fan design - size: 12.5 x 12.5 x 5 cm, portable and compact, suitable for home, outdoor activities and travel.