The NA-FC1 is a compact, highly flexible control for 4-pin PWM fans. It can be used independantly for manual speed control as well as in combination with the automatic fan control of desktop boards. Using the central rotary control, users can either manually set a PWM duty cycle of 0 to 100% or reduce the duty cycle transmitted by the mainboard in order to let the fans run slower than the automatic control of the mainboard allows. While the brightness of the orange status LED provides visual feedback on the current controller setting, theNo Stopmode can be activated by means of the pressure switch so that the fan does not fall below a speed of 300rpm. Thanks to the accompanying adapter cable up to 3 fans can be regulated at the same time and supplied directly via the power supply.PWM-based controlWhile most fan controllers rely on voltage-based control, the NA-FC1 uses the more advanced technology of pulse width modulation (PWM). This allows more efficient control and lower minimum