A tee of 13.5mm flat wire pigtails with the power connection passed through from the input to the output as well as the connection to the red and black power injection wires.
Input end: male connector with nut (end with exposed pins)
Output end: female connector with thread (end with holes)
The cable is marked with a label to indicate that the power connection connects to input, output and injection.
AKA Ray Wu pigtails.