A:Answer First, it will definitely work with your Sonata. I have a 2010 Elantra, and plug this unit into the 1/8" auxiliary jack on the front of the factory stereo, and it works great.
It comes with adhesive for both the phone button/microphone and the main unit (the little doohickey that connects to the cord that goes to the radio and the cord that goes to the phone button/microphone, and a plastic clip that I assume could be used for one of the other. That's it, but I'm not sure what else it would need. Once you tuck the cords away, it is small, simple, and unobtrusive.