Kia Soul 2018 Owner's Manual page 275

Audio system
AUX and USB port
You can use an AUX port to connect
audio devices and an USB port to
plug in an USB.
5 4
✽ ✽ NOTICE
When using a portable audio device
connected to the power outlet, noise
may occur during playback. If this
happens, use the power source of the
portable audio device.
OPS043194R