"Micro Cooling Fan" also called air double machine, it can produce natural continuous cool breeze, because no leaves, does not cover dust or injure curious children's fingers. Even more amazing is its peculiar shape, the appearance of both the flow lines and refreshing. "Micro Cooling Fan" inspired air blade hand dryer. Hand dryer principle is forcing air through a small opening "brush" dry hands in water, air double machine is to allow air from a 1.3 mm wide incision rotating around the ring blew out. "Micro Cooling Fan" because air is forced to blow out of the circle, by the amount of air can be increased to 15 times, can be increased to 35 km per hour.