Features: This 5 shaft Board with Optocoupler provides seamless integration with software and parallel port control to protect your computer from electrical surges. Designed with optocoupler isolation for all input signals, it supports input from 12-24V, anti reverse protective, and stop connectivity for enhanced safety. Ideal for machine operators, printing enthusiasts, and hobbyists who require precise stepper motor control in their projects. Use this board in engraving, printing setups, or machining applications to efficiently drive stepper motor Made from ABS, it delivers robust construction and long term stability for demanding industrial or workshop environments. Specifications: Component:Plastic Type:B/A Size:Approx.91X63mm/3.58x2.48inch Package Includes: 1Pc 5 shaft Control Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.