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DC 5V 12V 4 Wire PWM Fan Temperature Control Speed Controller Governor Regulator for PC Computer CPU Fan Cooler Alarm Module - AliExpress
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Project] Arduino-based fan controller (4 fans) with support for automatic/manual control and speed display : r/buildapc
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Controlling a 4-wired fan PWM Signal using Arduino allows only two settings - Electrical Engineering Stack Exchange
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Amazon.com: Taidacent 2510-4P 3P Manual 4 Wires 0-5V 12V Fan Speed Controller PWM Speed Control On Off Switch for PC CPU Case Fan with Knob (White Connector with Plastic Black Knob) :
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