When buying "Tiny Cooling Fan" Many people are more concerned about its noise, which has become a problem many manufacturers, along with the application and the ambient temperature changes, sometimes it requires a different fan speed to meet demand. Some vendors specially designed adjustable fan speed "Tiny Cooling Fan", manual and automatic modes. Manual is designed to allow users to use low speed in winter to obtain a low noise, high speed to get a good cooling effect in the summer. Automatic class radiator thermostat with a thermostat sensor is generally capable of "Tiny Cooling Fan" of speed, temperature is high, the speed increase based on the current operating temperature control, low temperature, then reduce speed to achieve a dynamic balance, so that the cooling effect of wind noise and to maintain an optimal combination of points.