1. Supports up to 4- linkage control. The fourth can be set as the driven 2. Output pulse 100K, using minimum error interpolation algorithm, high machining accuracy 3. USB interface, suitable for any PC compatible computer such as netbooks, laptops, desktops, and tablets with USB interface. As long as the can run, the control card can be used. 4. Driver free design, better compatible with software and hardware environments (supporting WinXP and WIN7 systems) 5. Support automatic return to (zero return) The driven shaft automatically levels when returning to the Support automatic tool alignment Support emergency stop input Support limit switch access Support spindle control (PWM mode and relay mode) Provide 4-channel optocoupler isolated digital signal input Provides up to 12 digital signal inputs, with a default of 4 inputs Provide 4-channel output with optocoupler isolation relay Support handwheel interface Anti interference design, industrial grade components, high reliability Color:Red & Green Material:PCB Package Contents: 1 x USB CNC Controller Card 1 x USB cable 1 x CD Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.