What else is needed in order to get this to play DVDs?

well, a dvd player.
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I am open to trades. i need a new deck, subs, amps, speakers. pm me your offers

but if my car is non-navi, the only other thing I would need to get this working would be the dvd unit, correct?

can i see pictures of the navi buttons..really interested.

i will make pictures today of the buttons.
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its your option to hook up a carputer, or DVD player or REverse camera. Or a navigation/dvd player.

Can you PM me for the pictures of the controllers and unit.

i dont have the nav option, but i have a dvd deck flush mounted where the radio used to be, so if i understand you correct this will fit in the pocket where the nav supposed to go and i would be able to have the same movie on both monitors. if i am correct please pm me interested.