Luminous medals at the Opening of the Olympics: where to find?

Question

Data synchronization

Are there those among us who went to the Opening of the Olympics in Sochi, pulled off a luminous medal and are ready to take it apart for Habr?
What interests me the most is the way to synchronize all these medals around the stadium.

Answer 1

According to the First they said that the infrared projector gave them signals. It seems to me that this is the most reasonable solution - timers, radio signals, etc. require accounting for which flashlight sits where.

Answer 2

as an option, you can buy and disassemble
www.avito.ru/sochi/kollektsionirovanie/prodam_meda... it
seems not expensive but it will be interesting.

Answer 3

https://habrahabr.ru/post/214487/