For select Sony Uni-link equipped radios, the IPIFSON kit provides a direct audio input from any iPod with a dock connector, and charges the iPod while connected. The IPOD-SON includes a Uni-link "pigtail" adapter that is required to be plugged into the back of most Sony Uni-link equipped radios, and "fools" the radio into seeing a CD changer connected, allowing audio from the iPod into the radio.