... 3)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 ... current, power just 2.1W, energy saving. 4.Fan life can be 25000~30000 hours, can be used ... 62*190mm,product weight:535g,easy to carry. 8.Fan occupies small room, stable structure, can be placed ...