Can Someone help with my Audio/Visual setup or options?

[EDG08]

So I bought this X a month ago and cant figure out what these Alpine things in the back window do. I have a alpine DVD player in the back (see picture) and that runs the overhead dvd. That works fine but these things shouldn’t have anything to do with that right? I also so have the wireless headphones (there is a inferred light on the dvd overhead i think that is what runs the wireless headphones) My other question is what do the cables going into the silver box do? You can see in the picture one set (black monster component cable) then some generic audio visual cables lead into the box. Im assuming the audio visual feed the overhead DVD. but what are the monsters for?
I would like to add Bluetooth or tv to the nav system can i do this with my setup?
Thanks guys!