Mini USB Fan, AICase SummerRechargeable Quiet 4 Level Speed Wind Air Cooling Portable Personal Table Desktop Fan (Blueberry) Perfect fan for the office, home, dorm, study, library, games room, outdoor, travel Silent design, balanced and shock-absorbing body say goodbye to noise. To switch between 4-level-speed wind, just by rolling the fan easily. High efficient and more than 8 hours long working time Different ways to charge fan: connect micro USB charging cable via computer/notebook, car charger, power bank, wall USB charger, solar charger etc. The mini 4 speed fan is energy-saving and environmentally friendly and produces a soft breeze to keep you cool and relaxed.