Feature: 1. Power Off Memory: Comes with power off memory function, the motor controller adds more convenience to the operation. 2. Adjustable Speed: From 0.1 RPM to 999 RPM, the rotational speed is free and easy to adjust to meet your working needs. 3. Various Function: The step motor driver also enables simple adjustment on angle, distance and delay, very practical. 4. Safe Application: Ensuring reliable and efficient performance, the control module suits for 42 and 57 step motors. 5. Easy Maintenance: Digital display makes the adjusting much easier, and the installation and maintenance are very easy. Specification: Item Type: Step Motor Controller Type: YF-19 Power Supply Range: DC 8V~24V universal. Speed Range: 0.1~999 RPM. Package List: 1 x Step Motor Controller Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.