Features 1、High Quality Circuit Board: The speed controller adopts high quality circuit board, which has a longer service life. 2、Stable Performance: This simple and easy to use DC motor speed controller has stable performance. 3、Digital Display: The speed controller is designed with a digital display, which displays the percentage of actual speed to maximum speed. 4、Power off Memory Function: The speed controller has the function of memorizing the last set speed value after power off. 5、Professional Manufacturing: This is a professionally manufactured speed controller with superb craftsmanship and high reliability. Specification Item Type: Stepper Motor Driver Board Model: YF-18 Adjustable Speed Range: 0.1-999 rpm Application: Stepper Motor, DC Motor Package List 1 x Speed ​​Control Module 1 x Cable