Dvd Headrest Mount Two (2) Independent Portable Dvd Players That Can Show 1 Movie On Both At The Same Time?

Two (2) independent portable dvd players that can show 1 movie on both at the same time? - dvd headrest mount

Is there a portable DVD player (which can be mounted in my car / head), which can connect to a portable DVD player for the second connection and play a movie in one and show that in two?

I bought 2 portable DVD player from Panasonic for my car and tried to work some things consecutivley. It seems that I am at a loss to work on, so I hope that someone a different set of 2 portable DVD players that it can recommend possible to make.

Thank you in advance for all suggestions.