–Manually control: manually adjust X, Y, Z axis location as engraving starting point, manually open or close
spindle, manully open or close cooling fan
–File engraving: after off-line controller save file, it can connect the GRBL control board and process
engraving, no need to connect PC computer
–Save file: after the off-line controller connect PC, it will be recognized as USB, large capacity storage device,
can access engraving file directly.