Description 1. Supports 4-axis linkage, allowing you to connect four stepper motors or servo drives. 2. Maximum step-pulse frequency is 100KHz, suitable for servo or stepper motors. 3. Supports automatic probe tooling. 4. Supports Emergency Stop input. 5. Supports limit switch. 6. Supports connection of an electronic handwheel. 7. Requires an external 24V DC power supply to isolate the USB and external ports, ensuring a more stable system. 8. Features a 0-10V output port, enabling you to use Mach3 software to control the spindle motor speed. 9. Includes 4 general-purpose inputs, allowing you to connect limit switches, emergency stop switches, probe switches, return-to-zero switches, and other devices. 10. Provides 4 general-purpose isolated relay drive output interfaces, capable of driving four relays to control spindle start, forward rotation, reverse rotation, pumps, and other devices. 11. 1 status LED indicates the connection status on the board. Size: 8x7.7cm / 3.15x3.03 inches Quantity: 1 Set Please ensure you do not mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x USB CNC Controller Board 1 x USB Cable 1 x CD