Faber gives Montag a type of earpiece that allows the two of them to hear each other. With the earpiece in, Montag can hear Faber give him instructions. This is important because Montag is worried that Beatty will try to talk him into giving up the books and the knowledge.
This situation is a little ironic because of the way Mildred's use of the ear pieces are described.
One theme found throughout The Odyssey is that good leaders take responsibility for those in their charge. Which lines from the text best ...
1. Contains important nerve endings: cochlea
2. eardrum: tympanic membrane
3. hammer: malleus
4. maintains body equilibrium: semicircular canals
5. anvil: incus
6. stirrup: stapes
Ralph because he's not completely mad like jack is and jack is only out for himself