Minhe USB Portable Fan - 30&deg; Angle adjustment Quiet Double Leaf Cooling Desktop Fan for Office, Travel, Home, School, Dorm, Game Room, Household Fan (Black) POWERFUL & QUIET: the fan blades rotate in opposite directions to produce powerful freeze and make low noise. Sometimes the fan sound is so annoyed, but the mini quiet fan can solve this problem for you. Provide a peaceful environment to you whatever you are working , studying, reading or sleeping. There are two modes:1-Weak; 2-Strong. PORTABLE & CONVENIENCE: The mini size fan fits easily into the bag, making it perfect for travelling. And there is the 5v USB port which can operate from a computer, laptop, power bank and other USB outlet. Wide compatibility is perfect for the Office, Library, Home, Dorm, Game room, etc. DURABLE & FLEXIBLE: The high-quality environmental ABS material , long-lasting and not easy to scratches. The fan can be adjusted to 30 vertically, you can change the direction as your wishes. EASY TO DISASSEMBLE: For your healthy, it's necessary to clean dust on the fan. This fan is so easy to operate , just gently turn on the cover, then you can clean it. GURANTEED PURCHASE: Money Back if you don't satisfied. And We provide the warranty for this product-- within 60 days, refund/ replace for any reason. Replacement service-any broken fans within one year of purchase.