Item Name：Huadi 6V 12V 24V 28V 3A 80W DC Motor Speed Controller Operating instruction: Before you're attempting to wire the controller, make sure that power is off.Step1: Connect wires refer to the “wiring diagram”(NO.5 picture).Step2: Turn on the power, and adjust the potentiometer. Step3: The LED indicates the power up and the speed of motor. Warning: Do not reverse positive and negative power loads. This will damage the controller! Customer Service: If you have any questions about the product or the order, just CONTACT US directly through the order, and we will give you a satisfactory solution within 1 working day。