It's really an ordinary umbrella with a mild electric shock device build into the handle.
7 seconds sound clip from Batman (1966) - The Cat's Meow (S2E29) TV Series.
You can hear this line at 00:04:27 in the Blu-ray version of the movie.
Quote context
[...]
- A criminal has to get up pretty early in the morning to outwit you, Batman.
- Would you check on the location of Joker, Riddler and Penguin?
- We'll meet you in your office as soon as possible.
- It's really an ordinary umbrella with a mild electric shock device build into the handle.
- Hardly enough to cause a man to lose his speech.
- Well, he's not in any pain, but he can't say a word for the life of him.
- A serious detriment for an announcer.
- Poor man has been checked from toenails to tonsils, but all to no avail.
- I think we should concentrate on who did it rather than how it was done.
[...]