DC 12V Manual 4-wire PWM Fan Speed Controller With Knob Switch Fan Speed Control
PWM signal mode: 5V 25KHZ. PWM signal output range: 0%-100%. Circuit size: circuit board 26mm 20mm knob screw out 15mm installation openings 7mm. 1 Fan Speed Regulator. Circuit board itself loss: not connected to the fan less than 20mA.