The current production of "Micro Cooling Fan", depending on the nature of the power supply can be divided into AC, DC and AC and DC fans. General household and daily use are single-phase AC fans, and general transport, such as cars, boats, etc., the more DC or AC and DC fans, while the three-phase AC fans are mainly used in the mining industry. Press the "Micro Cooling Fan" control different functions, fans can be divided into Simple, universal high-grade type. Simple is no governor mechanism, only directional, single-speed function, which is "Micro Cooling Fan" of primary products, is now rare. Universal fan, shaking his head and generally has a transfer function.