The VE.Direct Cable from Victron is required to connect devices that are to communicate with each other via the VE-Direct port. For example, the BlueSolar controllers and the MPPT Control remote control panel. The following connections can be established with it: Victron BlueSolar MPPT controller to Victron Color Control GX panelVictron BlueSolar MPPT controller to MPPT Control remote control unitBMV70xxx series to Color Control GX PanelBMV60xxx series for Color Control GX PanelPhoenix Inverter 12V 24V 48V 250W-500W to Color Control GX Panel The VE.Direct cables are not included with these device series and are available in lengths from 0.3 to 10m. Scope of delivery: 1x Victron VE.Direct Cable