All-copper frequency conversion motor mute noise, durable, 3-blade resistance is small, the motor load is reduced by 25% to enhance the service life. PC fan blade thickened and widened wide-area wind delivery, the use of aerodynamic principles, imitation wing design, static with stability, enjoy comfortable natural wind. Eye protection light source to enjoy comfortable natural light, reduce or eliminate low-frequency light that causes visual fatigue, away from the harm of blue light close to the natural light color, reduce the burden of glasses to care for eye health. Positive turn cool reverse wind delivery, winter and summer can be used, can be adjusted with the gear different wind speed, winter and summer dual-use. No video flash to guard the eye health of the whole family, with comfortable natural light, away from the harm of blue light.