Special Features 3 Speed Adjustable, 360° Rotation, Lightweight & Portable, USB Powered, Ultra Quiet. You can press the button repeatedly on the back of the desk fan to switch the mode. Soft wind: 1900 rpm, 2.8m/s; cool wind: 2500 rpm, 3.8 m/s; strong wind: 3400 rpm, 5.3 m/s.
