Comments about the above-linked unit:
1) The photo looks like it's made of cheap resin. I'm sure it's a mockup at the very most.
2) Explain this one:
Someone screwed up there.Model Number: NW711VT
7-Inch 15:9 In-Car Headrest VGA TFT LCD Monitor with Touchscreen.
In-Dash mount, motorized
3) It's supposed to include a modest amplifier. That's a plus, to be certain.
Completely unrelated to the unit and its specs, who thought that Spiderman swinging over the stylized WinXP logo was a good idea? That just looks silly, IMHO. It also wouldn't surprise me if either MS or Marvel took issue with it. Who knows.