Used in many applications "Tiny Cooling Fan" to cool down, but the fans will bring mechanical failure, increasing power consumption and noise. Therefore, the fan speed should be monitored and controlled in order to solve these problems, so that the fan is more reliable, lower power consumption and noise. Since the brush less DC fan to use, reliable, and therefore is the preferred solution of most electronic products. It is a two-terminal devices, can work together with the DC voltage. "Tiny Cooling Fan" DC voltage voltage 5V, 12V, 24V and 48V, 12V fan of the current election and more. With the reduction in the power of 12V, 5V will increase the amount of the fan. The field of telecommunications in general use 48V fan. Brush less DC fan commutation rectifier is electronically controlled internal fan, old-fashioned "Tiny Cooling Fan" mechanical engineering brush, which will produce a higher EMI, and easily damaged.