Tsing Mini USB Fan with Rechargeable Lithium Battery and 3 Types of Wind, Idea for Traveling, Hiking, studying, etc. (Blue) Longer Working Time: Built-in 18650 international standard rechargeable lithium battery with extra large capacity supports up to 10 hours working time on a charge. Quite & Energy-efficient: Equipped with pure copper and brush-less motor, which is featured by quite operation and efficient energy saving. USB Cable for Charging: Can be directly connected the charger which has the USB connector, for example, PC, power source, car USB charger, etc. Incredible Compact: Only 7.4oz weight & 1.9in thickness; stylish and compact body slips easily into your bag for use on the go. Optional Wind: One button controls 3 different types of wind (Breeze & Natural wind & Strong breeze).