What kind of flash LEDs are used in garlands?

Question

LEDs

I was always interested in what kind of LEDs are used in this type of garlands: https://youtu.be/XDSeRQ8d4aU (not advertising !!!). These are the ones that flicker white. How do they work? Do they have a blueprint inside? Are these sold separately? Aliexpress, for example.

Answer 1

Yes, there is a diagram inside. And yes, they are sold, similar ones in ChipDip even found
their approximate device, you can read in the article
https://habr.com/ru/post/206556/