What will Elijah's and Enoch's preaching look like?

Before Antichrist, Elias and Enoch will preach for 1,260 days: Apoc. 11:3 : >And I will give unto my two witnesses [Elias and Enoch], and they shall prophesy a thousand two hundred sixty days, clothed in sackcloth What exactly will their preaching look like, according to Catholic commentators? Will it involve modern communication technologies like the internet, radio communication, etc.? Or will it be strictly word-of-mouth preaching?