This stepper motor drive controller adds a function that can generates PWM signals, there is a jumper on the board, you can set the working mode, the default set is to generate pulse frequency signal. This controller has three kinds of high, medium and low frequency signals can be selected with a jump pin. 2 groups of power input design, but it can be used after connected to one group of power supplys. One is 15-160VDC power supplys. the other group is 5-12VDC. Motor forward and reverse as well as open and close can be controlled by the button. The speed of the motor can be controlled by adjusting the potentiometer to change the frequency. Specifications: Name: Motor Drive Controller Material: printed circuit board Item size: 73 * 51 * 38mm / 2.87 * 2.01 * 1.50in Package size: 100 * 80 * 50mm / 3.94 * 3.15 * 1.97in Package weight: 43g / 1.52ounce Packing List: 1 * Motor Drive Controller