"Tiny Cooling Fan" name suggests is through the input AC power to the AC motor to drive the rotating fan impeller rotation, enabling the exchange of electrical energy to mechanical energy conversion process called AC fan blower fan. "Tiny Cooling Fan" the biggest feature is the optional AC motors. AC fan speed is the number of revolutions per minute of the fan blades, the unit is rpm. Fan speed is determined by the motor inside the coil turns, voltage, number of fan blades, angle, height, diameter and bearing systems. Speed and "Tiny Cooling Fan" quality is not necessarily linked. Fan speed can be measured by the internal speed signal, it can also be measured by the external.