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This fan speed controller is compatible with DIY cooling devices such as 12V four wire fans, water pumps, and small hosts. It is equipped with a 4-pin 5-way hub and can drive multiple fans simultaneously.Supports 4-pin 12V PWM speed regulation, with knob control for 0% -100% speed. Powered by USB,built in boost circuit, 5V to 12V, stable performance. The packaging includes a controller, USB-C cable, and hub.