I have the identical widget (except for "11" instead of "39" on the USB connector).
You need an AMP Superseal 3 way male connector with male pins, like
this, and suitable length (1m for RHD, 3-4m for LHD?) of 3 way cable. The cable I have is 240V mains cable suitable for low power lighting etc., the individual wires are 1.5mm diameter including the insulation, the smallest size to be a good fit inside the yellow seals (although the connector I have does not have any seals).
The AMP 3 way connector housing has numbers 1, 2 and 3 marked on the end where the wires enter. Using the standard wire colours of mains cable in the UK (same as Portugal?) they are 1-blue, 2-green/yellow and 3-brown.
At the widget end, the red wire is already in position 1 (of 4) and the others are 2-green/yellow, 3-blue and 4-brown.
I can upload some pictures that will help if the above is not clear.