Features: Support for 4-axis linkage, allowing connection of four stepper motor drives or servo drives. Maximum step-pulse frequency is 100KHz, suitable for servo or stepper motors. Supports automatic probe tool, emergency stop input, limit switches, and electronic hand wheel connection. Requires external 24V DC power supply to isolate USB and external ports for improved system stability. Includes 0-10V output port for spindle motor speed control using MACH3 software. Equipped with 4 general-purpose inputs for connecting limit switches, emergency stop switch, probe switch, home switch, and other devices. Features 4 general-purpose isolated relay drive outputs to control spindle start, forward and reverse rotation, pumps, and other equipment. Status LED indicates board connection status.Specifications: Size: Approx. 8 x 7.7cm / 3.15 x 3.03 inches. Weight: 160gPackage Included: 1 x USB CNC Controller Card, 1 x USB Cable, 1 x CDNote: Please note that the new or old version of this product may be shipped randomly. Ensure you are comfortable with this before placing your order.