... Battery and USB powered fan 1)Personal fan powered by USB or battery 2)Two speed choice,quiet&cooling wind 3)Long using life Battery ... and USB powered mini desk fan 1.1700RPM,3.1m/s wind ... , power just 2.1W, energy saving. 4.Fan life can be 25000~30000 hours, can be ... 190mm,product weight:535g,easy to carry. 8.Fan occupies small room, stable structure, can be placed ...