The cable allows you to replace the unit present in your car (ENTRYNAV - ENTRYNAV 2 - NBT) with the NBT EVO unit without having to cut the original wiring.
It will be sufficient to move the four cables indicated in the instructions from the original connector to the 4POL Male connector and connect the OABR port to the new NBT EVO unit.
This adapter thus allows you to install the unit without damaging the original wiring and without necessarily interposing a new connection for all the cables present in the main connector of the unit.
If in the future you need to remove the unit and return to the original configuration, simply reposition the PINs in their original location.
