This USB motion control card has the below advantages: small volume, easy to use, has a strong anti-interference ability, No need to install any USB drivers,it can be used after plugging in the computer. ,suitable for all versions of Windows. Fully supporting all Mach3 versions. 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 handwheel 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; 1 status LED, indicate connection status on the board. Specification: Product name: MACH3 motion control card Support Axis:4 Support drive type: stepper/servo driver Maximum step-pulse frequency:100KHz Weight: Approx.128g/4.5oz Package list: 1 x Mach3 Motion Card 1 x cable