Amazon.com: Speed Controller 12V PWM 4-Wire PC Fan Temperature Semiconductor Speed Controller : Industrial & Scientific
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4-Wire fans
DC 12V PWM Fan Governor Speed Control w/ Knob 4-Wire Switch Fan Speed Controller | eBay
Amazon.com: PartsCollection 12V Fan 80MM x 80MM x 15MM 4-Wire / 4-Pin Connector Plug : Electronics
DC 5V 12V 4 Wire PWM Fan Temperature Control Speed Controller Governor Regulator for PC Computer CPU Fan Cooler Alarm Module - AliExpress
diymore DC 5V/12V 4 Wire PWM Computer CPU Fan Temperature Speed Controller Module 40cm Ring/10cm Dot Temperature Sensor Probe - AliExpress
New EVERFLOW T126010SU 12V 0.25AMP 6010 4-wire Cooling Fan High Grade Quality | eBay
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) :
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 (Solder Connector with Plastic Black Knob) :