Azest DRX9255 DRX9255EX DRX9255EXL This is a cable for using the AUX function. Connect it to the 13P C-BUS connector and connect the red and black wires to switch to ACCS, enabling external input. When installed in a car, extend the red and black wires and attach a suitable switch. When connecting to a smartphone, set the smartphone's volume to maximum. If you want to connect a CD changer at the same time, you will need a switching unit RCB-037-500. There are scratches and dirt. Defective products will be exchanged, but removal labor costs and deck failures are not covered. No price reduction.