The Pioneer rd-rgb150a RGB extension DIN cable, antenna wire, power and ground wires for dhm-c head units will be used when you need extra length on the DIN/RGB cable, antenna wire, power and ground wires during installation. This extends the DIN/RGB cable An additional 59 in., the antenna wire 29.5 in. And the power wires 59 in. This extension cable and wire package may be necessary when performing a nonstandard double DIN ISO mount installation.