The Focus Expansion Module attaches to the DJI Focus Remote Controller and pairs wirelessly to a Lightbridge 2/Matrice 600 remote controller. Can be used with the DJI Follow Focus Motor 2007 for remote focus adjustment or the Zenmuse X5/X5R for remote focus/aperture adjustment.
When using the DJI Focus with the Matrice 600 and the Ronin-MX, the Ronin-MX can provide power and signal communication to DJI Focus motor through the DJI Focus Expansion Module Power and Data cable, so you can adjust focus from a distance using the DJI Focus expansion module.