Connect the power supply: Connect a DC power supply and that the DC power supply voltage range is 12V-36V and that the power output meets the motor's working requirements Do not connect the positive and negative terminals of the DC power supply in reverse, otherwise the speed regulator may be damaged Connect the motor: The motor line can be either positive or negative. If the running direction is inconsistent with the expectation, you can change it by adjusting sequence or switch position Adjust the potentiometer knob: Adjusting the potentiometer knob can change the output duty cycle of the speed regulator and the motor speed Working voltage: 12V-36V universal Working current: 3A Speed range: motor zero speed to motor maximum speed The maximum current can reach 6A. A larger heat sink or cooling fan is required. Size:56x36x26MM Mounting hole center distance: 30MM x 51MM Color:As Shown Material:PCB Package Contents: 1 * PWM DC Motor Speed Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.