... Long using life Battery and USB powered mini desk fan 1.1700RPM,3.1m/s wind speed,150mm ... blade diameter, well-designed blades angle and number ,new DC brushless motor, strong wind, super quiet. 2 ... has been done by delicate processing, safe. 3.New generation of DC brushless technique, lower running voltage ... 190mm,product weight:535g,easy to carry. 8.Fan occupies small room, stable structure, can be ...