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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.

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    I'm assuming that the correct answer is "earwax, just like the rest of us" – Valorum Nov 24 '18 at 10:41
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    Bat-Wax! Clearly labelled, of course. – Paul D. Waite Nov 24 '18 at 11:12
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    @PaulD.Waite - Only YOU can help Batman remove his ear polyps; youtube.com/watch?v=GoKJcG47Aq4 – Valorum Nov 24 '18 at 11:39
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    What’s inside Batman’s ears? Bat-wax! Bat-wax! Bat-wax! Nah nah nah nah nah nah nah nah nah… Bat-wax!!! – Giacomo1968 Nov 25 '18 at 0:24
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    "what does he keep inside his ears?" As shown in the @Valorum answer... anything the plot requires him to keep in there!! – RonJohn Nov 25 '18 at 0:30
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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

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    +1 for the first image. BTW, Batman's cowl also has an anti-imbalance system to fight with Count Vertigo. – user931 Nov 24 '18 at 9:16
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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

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    Not to pick, but this panel doesn't show that his bat-ears contain a high gain antenna – Valorum Nov 24 '18 at 9:13

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