, , firm and has a long service life. The fan switched four gears in turn. The speed can be switched or the fan can be turned off during rotation, by short pressing each for time (four gears: the fan is a fast gear, a gear, a low gear and a stop gear), and the lights are indicated by four : red, Light, green light and extinguished light Fast gear: 3200±320 speed gear: 2800±280 Low speed gear: 2300±230