Features: Brand new and high quality Maximum step pulse frequency is 100KHz, supporting 4-axis linkage and connection to four stepper motor drivers. Supports automatic probe tool, emergency input, limit switches, and electronic handwheel connection with status indicator LED. Requires an external 24V DC power supply for isolation between USB and external ports, ensuring system stability. Features a 0-10V output port for controlling spindle motor speed via Mach3 software. Includes 4 general-purpose isolated relay output interfaces, capable of controlling 4 relays for spindle start, forward/reverse rotation, pumps, and other devices. Specifications: Material: ABS Size: Approx. 77.5x81.5mm/3.05x3.21inch Output Current: Minimum 1.4A, Maximum 5.6A Input Power Supply Voltage: Minimum 20V, Maximum 50V Step Pulse Frequency: 200KHz Insulation Resistance: 500M Temperature: 0~+50C Humidity: 40~90% Vibration: 10~55Hz/0.15mm Storage Temperature: -20~65C Note: 1. Please allow 1-2cm error due to manual measurement; ensure you don't mind before ordering. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1x Breakout Board