I purchased Rockville's touch-screen DVD headrests (with earphones) new last year through Walmart.com and had them professionally installed in my Acura. I've had to swap them out 4 times within the past 10 months as they continually malfunction and stop working.
Every-time one of them breaks, Rockville makes me remove the entire system (remotes, wires, headrests, etc), pack it all up, mail it back (at my expense) and wait weeks for the replacement. One time they simply repacked my devices and mailed them back to me without even repairing/replacing them so I re-installed the system, realized it was still broken and then had to uninstall and mail it back to them again (at my expense).
Their products are worthless junk. One headrest suddenly stopped working again today so I will soon be on my 5th system. They may as well be paper-weights. Don't waste your time or your money on these cheaply made pieces of garbage. A great concept poorly designed and executed.