With that head...you need a reciever and an antenna. Once you plug those into the head it'll enable the satellite functions and you can get the ESN number. It's not in/on your head unit...it's in the satellite reciever.
Kenwood is Sirius specific I believe.
You'll love it once you have it. I got Sirius the first week they got up and running. I don't even have an AM or FM station set in my radio anymore.
I bought a stand alone reciever for my work truck even....just can't live without it anymore.
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