Select the "Micro Cooling Fan" must be able to provide sufficient amount of exhaust (speed), under the high temperatures of the hot air inside the cooling device; when the temperature is relatively low and less when hot air is doing the opposite of work. Secondly, the position sensors installed option should pay attention to the sensor in the proper position, try to make the sensor can be directly clamped surface to be cooled. In operation, a temperature-controlled "Micro Cooling Fan", will run at a faster pace if the thermistor feel higher temperatures; and at lower temperatures, it will operate at a lower speed; higher in these and an intermediate low, fan speed will hardly due to temperature change. Under "Micro Cooling Fan" in the case of slow temperature changes, the fan speed changes relatively slowly, not suddenly change the fan speed and noise. The reaction time depends mainly on the length of its heat-sensing sensor sensitivity.