Features: Support for 4-axis linkage, you can stepper motor drives or servo drives. Maximum step-pulse frequency is 100KHz, which is suitable for the servo or stepping motor. Support automatic probe tool. Support emergency input. Support for limit switch. Support for connecting electronic hand wheel. Need use external 24V DC power supply to isolate USB and external port, and to make the system more stable. Have 0-10V output port, you can use software to control the spindle motor speed. 4 general-purpose inputs, you can connect the limit switch, estop switch, probe switch, back to zero and other device. 4 general-purpose isolated relay drive output interface, can drive four relays for controlling the spindle starts, forward rotating and reverse rotating, pumps and other device. Status LED, indicate connection status on the board. Specifications: Size: 8 x 7.7cm/3.15 x 3.03inch Weight: 160g Package Included: 1 x USB CNC Controller Card 1 x USB cable 1 x CD