Tejas,
If you have kids, then the best thing to do is get this system. If not, get it anyway. The manufacture is Invision
http://www.invisionindustries.com/ even though Hummer's version does not display the Invision name on it.
They are both independent individual units that can be played together or seperate. The DVD's load in the top of each unit. Wireless headphones should be included and also a remote. and yes the dealer will wire this up in order for it to be played on you FM radio. I have not taken pics of mine yet but there is a thread that someone posted of theirs. I can not find it...
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2006 Yellow H3 Adventure Package with 35" Firestone Destination MT Tires, Torsion Bar Adjustment, Trail Duty Extended Bump Stops, Chrome Trim Package, XM radio, 6 Disc Monsoon Stereo, Marker Lights, Brush Guard, Chrome Nerf Bars.
www.centexhummerclub.com