Powerful Summer Fan
The small fan has 3 speeds, can provide strong wind to cool you down quickly.
First Gear -- Soft wind, the rotating speed is 1700rpm, wind speed is 2.5m/s, and noisy degree is 30db;
Second Gear -- Cool wind, the rotating speed is 2100rpm, wind speed is 3.2m/s, and noisy degree is 45db;
Third Gear -- Strong wind, the rotating speed is 2400rpm, wind speed is 3.8m/s, and noisy degree is 55db.
(The data was tested when the machine had a 6" distance from the fan.)