hora123 , the ebay ad you linked says in the description that it plays .AMV converted videos, which means it's an Actions chipset. Which also means it does not play .AVI files.
However, it also comes with a built-in camera. Which as far as I know the older ATJ2085, and ATJ209* series does not support. Maybe it does, but have not seen one with a camera.
It could be the newer ATJ2135 chipset that DaremoS posted a few weeks back here
http://www.mympxplayer.org/1-vt7655....r=asc&&start=0
Which again does not have any mention of a camera feature, maybe it does support but not incorporated.