Item Type: Motion Controller Card Maximum Step Pulse Frequency: 100Khz Motherboard Dimension: Approx. 8 x 7.7cm / 3.15 x 3.03in Package List 1 x USB CNC Controller Card 1 x USB Cable 1 x Driver Installation CD Please allow 13mm error due to manual measurement. Thanks for your understanding. 1MULTIPLE FUNCTIONS: The functions of this motion control card include support for automatic probe, emergency input, limit switch, support for connecting electronic handwheels 2FOUR AXES LINKAGE: The USB interface board can connect four stepper motor drives or servo drives. 4 way universal input, can be connected to limit switch, emergency stop switch, probe switch, 0 return and other devices 3100KHZ PULSE FREQUENCY: The maximum step pulse frequency of the motion control card is 100KHz, very suitable for CNC engraving, servo motor, stepper motor servo motor 4STABLE AND CONTROLLABLE: The motion controller needs to use an external 24V DC power supply to isolate the USB and external ports, making the system more stable. And there is a 010V output port, you can use software to control the speed of the spindle motor 5UNIVERSAL INTERFACE: 4 universal isolated relay drive output interfaces can drive 4 relays to control spindle start, CW and CCW, pumps and other equipment