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Features: CCMFC DC Motor Speed Controller provides variable speed capability for brush or brushless DC fans, or the fans without control line. Input voltage: 12VDC Suitable for the DC fan within 1A, Peak current 2A. Low noise, small size. Operating instruction: Before you attempting to wire the controller, make sure power is off. WARNING: DO NOT REVERSE POSTIVE AND NEGATIVE POWER LOADS AND DC FAN.THIS WILL DAMAGE THE CONTROLLER. 1.Connect wires refer to the product wiring diagram.(No.4 picture) (Red wire connects the positive power; black wire connects negative power; white wire connects the positive of fan; green wire connects the negative of fan.) 2. Turn on the power, and adjust the potentiometer. Package Including: 1 x DC Motor Speed Controller 1 x button switch (a gift free)