07 Quad cab overhead dVd player?

[RonCar]

This questions is for those of you that had it installed at the dealer AND for those of you that bought a truck that already had it. Can you listen to the overhead dvd system threw the truck speakers as well as headphones or does it even come with headphones? I am thinking of having the overhead dvd system installed in a dually I am looking at and wanted to no ahead of time, thanks...