different settings, better quality, warranty, name brands like Kenwood, Alpine, Eclipse etc.. last longer then ebay ones. IMO id only go with name brand no ebay ones
97 GTP DD, 1952 Ford F-1 Resto Project, 2006 Mustang GT "UnDeR CoNsTrUcTiOn", 02 GPGT SOLD!, 98 GTP Parted/Scraped