... speed,150mm blade diameter, well-designed blades angle and number ,new DC brushless motor, strong wind ... of DC brushless technique, lower running voltage and current, power just 2.1W, energy saving ... decoration of metal,bring simple sense of beauty and quality. 6.Fan is with control switch ... used in any occasion. 10.Sofe wind, cool and refreshing, comfortable. SpecificationsPower source: USB or 4 ...