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 ControllerType: YF-19Power Supply Range: DC 8V~24V universal. Speed Range: 0.1~999 RPM.Package List:1 x Step Motor ControllerNote: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.