Answer: Faber gives Montag a two-way radio that he has created that will fit in Montag's ear; that way the professor can hear what Beatty has to say and also prompt Montag.
Montag considers himself a coward because he never took a stand against the burning of books.
Explanation: One night Montag asks for help with Beatty that night, and Faber gives him a radio that he has created so that the professor can hear what Beatty has to say and also prompt Montag.
He consider himself cowardly because he doesn't speak against what the government is doing with the books.