Mod·al verbnounGRAMMARplural noun: modal verbsan auxiliary verb that expresses necessity or possibility. English modal verbs include must, shall, will, should, would, can, could, may, and might.
Faber gives Montag a seashell radio-like device in order to overhear Montag's conversations with Captain Beatty, so he can instruct him with what to say. Faber considers himself a coward.