Features 【Digital Display】: The speed controller is designed with a digital display, which displays the percentage of actual speed to maximum speed. 【Power off Memory Function】: The speed controller has the function of memorizing the last set speed value after power off. 【Professional Manufacturing】: This is a professionally manufactured speed controller with superb craftsmanship and high reliability. 【Stable Performance】: This simple and easy to use DC motor speed controller has stable performance. 【High Quality Circuit Board】: The speed controller adopts high quality circuit board, which has a longer service life. Specification: Item Type: Stepper Motor Driver Board Model: YF-18 Input Voltage: DC8-24V Adjustable Speed Range: 0.1-999 rpm Application: Stepper Motor, DC Motor Package List: 1 x Speed Control Module 1 x Cable Package List 1 x Speed ​​Control Module 1 x Cable