Every word those criminals said was recorded in the Batmobile.

6 seconds sound clip from Batman (1966) - He Meets His Match, the Grisly Ghoul (S1E16) TV Series.

You can hear this line at 00:05:12 in the Blu-ray version of the movie.

Quote context

[...]

- A mobile slot machine torture van. The mere possession of such a vehicle violates 17 separate statutes.

- And not a shred of evidence tying it to the devilish Joker. No fingerprints, stolen license plates...

- You overlooked this, Chief O'Hara.

- A reel of tape?

- Right. The tape from our anti-crime recorder.

- Before setting out tonight, I equipped my utility belt with a tiny microphone and transmitter.

- Every word those criminals said was recorded in the Batmobile.

- But what good will that do, Boy wonder?

- I thought you said they spoke to you through a trick voice distorter.

- Tricky, commissioner. Tricky, but vain.

- They didn't realize that every human voice has its own private wave pattern. Private as a fingerprint.

[...]