Scythe KQ02-BK Kaze Q12 12 Channel Fan Controller - Black Kaze Q12 is the perfect choice with its total of 12 fan channels for maximum utilization Fan speed is adjusted for both models using voltage regulations for each channel separately with a control range between 5 and 12 volts voltage is flowing over one of the channels the corresponding channel's LED is visualizing this by illuminating in blue color. It's furthermore possible to completely turn of each fan channel if required.