[ Instead of telling him how it works, he shows him and speaks to the locket, still enamoured of the ingenuity of the bauble after accepting it usage on a daily basis. ]

Bilbo Baggins; show me his face. [ A nod is given to the hobbit as Bilbo's locket chimes. ] Open yours. They have scrying properties, inasmuch as I can tell. A wizard might know more, but I think it is safe to assume that much through common sense.