Optocoupler Isolation with Automatic Recognition: Enhanced with offline recognition, this cnc engraver control board allows simultaneous connection of an offline module and computer. The optocoupler isolation in the spindle drive minimizes heat generation, ensuring linear and safe spindle speed regulation. Improved USB Interface: Upgraded USB interface with a plug-in design for enhanced durability, reducing the ri-sk of detachment due to portation or improper use. Versatile Compatibility: Compatible with GRBL Controller and UniversalGcodeSender software, supporting stepper motors with 12V and a maximum current of 2A. Perfect for any 42 or 57 stepper motor. Spindle and Laser Support: Equipped to support 400W DC spindle motors and la-sers, providing comprehensive control for three axes, spindle, and la-ser head.User-Friendly Design: Convenient power interface with a 5.5-2.5mm DC interface, easy-to-use USB data cable included. Supports Win- XP, 7, 8, 10 operating systems. AUTOMATICALLY IDENTIFY WITH OPTOCOUPLER ISOLATION: Add offline recognition, can insert offline module and computer at the same time. Offline automatically identify whether there is computer control. The spindle drive increases the optocoupler isolation, so that the control board generates less heat, and the spindle speed regulation is more linear and IMPROVED USB INTERFACE: The USB interface is patch welding, easy to drop due to portation collision and improper use, and now it is changed to a plug in, very powerful Item Type: CNC Engraving Machine Control Board Connection: USB (USB CH340) Software: For GRBL Controller, for UniversalGcodeSender Main Control Chip: For 328P Spindle Drive Chip: For MOSFET (recommended 24V, current within 10A) Spindle PWM Speed Regulation: Support Support Stepper Motor: 12V,within 1.5A, it is recommended that the maximum current be less than 2A, and heating. (any stepper motor 42, 57)<