We have seen during the movie that Kylo Ren's mask is really heavy.
We also can guess that the primary reason Kylo Ren wears his mask is to mark his link with the Knights of Ren, as an intimidation tool and as an homage to Darth Vader.(Why does Kylo Ren wear a mask?)
But do we know if Kylo Ren's mask actually has any internal function, besides the obvious Voice Changer?
Does it have an HUD that gets displayed in front of the wearer's eyes? Does it have some sort of built-in function to communicate with other people such as stormtroopers?