Portable Dvd Players Can You Get Portable Dvd Players To Play Through The Cars Speakers?

Can you get portable dvd players to play through the cars speakers? - portable dvd players

I want to buy Monitors Headrest DVD player in my 2005 Equinox. somehow able to play the sound through my speakers? the two heads of DVD players they have ... seem to be less expensive than spereate monitors and DVD players do not tailored to accommodate the headrest monitors.