Built-in pulse-width modulation (PWM) technology regulates the voltage signal between fully on and fully off, controlling the speed of a fan. The main advantage is that power loss in the switching device is very low. When a switch is off, there is practically no current, and when it is on, there is almost no voltage drop across the switch. Therefore, power loss is close to zero. This thermal technology provides better performance, high reliability, and a cost-effective thermal cooling solution.