"Small Cooling Fan" leading inverter technology to achieve ultra-low power 1.7W, the motor speed is as low as 90 revolutions per minute. Traditional fan motor, the general speed can be up to 200 revolutions per minute, the wind is strong enough, but it is an important reason for being disgusted enough quiet! Similarly, as the audience, I also want a "Small Cooling Fan" in the same time gives me a cool feeling, but also gentle and quiet, especially in sleep time, can do, "only the wind, no sound" considered the sleep environment demanding team best companion crowd. Frequency "Small Cooling Fan", low speed motor runs continuously, the minimum speed can be done 90 revolutions per minute, plus a rotary-nine blades, the wind is so uniform and stable, while more quiet and gentle, allowing you to at the same time feel a cool summer, with a quiet sleep without disturbance stability. United States of inverter fan, is committed to the customer to create a quiet and comfortable living experience.