Function: 1. Shutdown memory: Equipped with shutdown memory function, motor controller increases the convenience of operation. 2. Adjustable speed: from 0,1 rpm. min to 999 rpm /min rotation speed is arbitrary and easy to adapt to your working needs. 3. Various functions: The stepper motor controller also allows you to easily adjust the angle, distance, and delay, which is very practical. 4. Safe application: Providing reliable and efficient performance, the control module fits 42 and 57 stepper motors. 5. Easy maintenance: The digital display makes it easy to adjust, and installation and maintenance are very easy. Specification: Item Type: Stepper Motor Driver Type: YF-19 Power supply range: DC 8 V ~ 24 V universal. Speed Range: 0,1~999rpm /min List of packages: 1 x Stepper Motor Driver