Features Wide Compatibility: Compatible with NEMA 17, 23, and 34 stepper motors, ensuring versatility for various applications. Advanced Speed Control: Offers 6 speed modes with up to 32 segments, providing and customizable motor control for different al needs. Enhanced Safety Features: Equipped with high-speed optical isolation, offline hold function, and built-in thermal and overcurrent protection for reliable and secure . Robust Construction: Semi-closed chassis design enhances durability, making it suitable for demanding environments while providing semi-automatic current locking. Flexible Power Supply: Supports a wide range of 9V-42V DC power supply, featuring H-bridge bipolar constant phase ing drive for efficient motor performance. Features: 1、9V-42V DC power supply, H-bridge bipolar constant phase ing drive 2、Provide 6 seed modes up to 32 segments 3、Input signal is high speed optical isolation, standard common anode single pulse interface, offline hold function 4、Semi-closed chassis for more demanding environments, provide energy semi-automatic current locking 5、Built-in thermal protection and overcurrent protection Specification: Condition: 100% Item Type: Stepper Motor Driver Material: Aluminum Rated Current: 4A Rated Voltage: DC42V Size: Approx. 10 x 3 x 6cm / 3.9 x 1.2 x 2.4in Package List: 1 x Stepper Motor Driver 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. Package List 1 x Stepper Motor Driver