This picture shows Batman missing an ear from his costume.

Batman with right bat ear missing

Which made me think, what does he keep inside his ears?

  • Radio receiver to listen to police broadcasts?
  • Radio connection back to Batmobile or to the Batcave?
  • Super-sensitive sound sensors?
  • Hidden weapons?
  • Tiny little cameras?

Accepting answers from official sources.

  • 15
    I'm assuming that the correct answer is "earwax, just like the rest of us"
    – Valorum
    Commented Nov 24, 2018 at 10:41
  • 7
    Bat-Wax! Clearly labelled, of course. Commented Nov 24, 2018 at 11:12
  • 1
    @PaulD.Waite - Only YOU can help Batman remove his ear polyps; youtube.com/watch?v=GoKJcG47Aq4
    – Valorum
    Commented Nov 24, 2018 at 11:39
  • 3
    "what does he keep inside his ears?" As shown in the @Valorum answer... anything the plot requires him to keep in there!!
    – RonJohn
    Commented Nov 25, 2018 at 0:30
  • To me, it looks like the ear is tilted backwards, not missing Commented Nov 25, 2018 at 11:50

2 Answers 2


It depends on the continuity, but it's typically a set of directional microphones and high-gain antennas to give him better-than-human hearing abilities. Because he's a bat, see?

tech inside the Bat cowl

The prop from Dawn of Justice contains similar technology, according to the DoJ: Tech Manual, describing the cowl as containing a

titanium core and a range of infrared and sonic comms

prop picture from different angles

In All Star Batman #2, we see that Batman's new cowl has ears that contain a little surprise, functioning as the handles of a pair of concealed knives

Batlan stabs with ear-knives

And in Batman and Robin #22, the ears can be ejected and work as thrown knives.

ears are ejected

  • 1
    +1 for the first image. BTW, Batman's cowl also has an anti-imbalance system to fight with Count Vertigo.
    – user931
    Commented Nov 24, 2018 at 9:16

Yeah, Batman's ears contain high-gain radio antennas which Batman uses to:

  • stay in contact with Alfred, Robin and Batgirl.

  • listen police radio broadcast.

It was shown in Batman: Detective Comics #741.

Batman calling Oracle

  • 10
    Not to pick, but this panel doesn't show that his bat-ears contain a high gain antenna
    – Valorum
    Commented Nov 24, 2018 at 9:13

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