Single DC 12V PWM Fan Temperature Controller 4-Wire Speed Governor Board +Probe

The three working modes are as follows. Factory defaults: 20% low speed, acceleration temperature of 30 ℃, acceleration width of 5 ℃. This temperature setting with the palm of the hand holding the thermal probe after a while will accelerate, the probe clip such as into the armpit in general within 2 minutes will reach full speed.

eBay