The NA-FC1 is a compact, highly flexible controller for 4-pin PWM fans. It can be used both independently for manual speed control and in combination with the automatic fan control of PC motherboards. Using the central rotary knob, users can either manually set a PWM duty cycle from 0 to 100% or reduce the duty cycle sent by the motherboard to make the fans run slower than what the motherboard's automatic control allows. The brightness of the orange status LED provides visual feedback on the current setting of the controller, and the push button can activate the "No Stop" mode, ensuring that the fan does not drop below a speed of 300 rpm. Thanks to the included adapter cables, up to 3 fans can be controlled simultaneously and powered directly through the power supply.