i just bought Philips Lumea BRI921 and i need some help.

hi i just bought Philips Lumea BRI921
pretty much, im a 18 yo boy and i have a lot of hair on all of my body and a fully beard and if u ask me about my experians as a 17 or 16 yo with hair amoung my friends and the people i know its disgisting.
so i bought this devies yesterday and today im gonna start using it.
i searched online and i found out that this devies cannot be used on face (for men)
so
my qusetion is why cant i use it on my face?
does any one of u guys treid it before?
and thanks in advance.