Does anybody know if the KVT-715 is the same as the KVT-815.I ordered one off a website for my vehicle yet on Kenwoods' website there is no hint of the 715 nowhere, even in the search fields. However when I downloaded a link to the 715s' user manual I got a download of the 815. So my question is does anyone know what the difference is on these units. They look identical and I am just curious as to why the dropped the KVT-715 title.