Features: Support for 4-axis linkage, you can connect four 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 MACH3 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: Approx. 8 x 7.7cm or 3.15 x 3.03inch Weight: 160g Package Included: 1 x USB CNC Controller Card1 x USB Cable1 x CD Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.