DC 12V 4-Wire Fan Temperature Controller PWM Speed Governor Board,Governor Board DC 12V 4-Wire Fan Temperature Controller PWM Speed, power off and remove the fan, At this temperature setting, holding the probe with the palm of the hand will accelerate in a few minutes, If the probe is clamped into the armpit, it will reach full speed in 2 minutes,First, Buy on the official website Get your own style now the highest quality products at the best price. Speed Governor Board DC 12V 4-Wire Fan Temperature Controller PWM.