The “Glow with the Show” Mickey mouse ears are currently being used in the Disney California Adventure Park. The ears are fitted with LEDs lights which sync with some of the attractions at the park. So if you and the person next to you wearing the same Mickey Mouse ears, it will start flashing the same color at the same time.
The Disney Parks Blog author Erin Glover and Disney California Adventure park Vice President Mary Niven in this video below explains the technical side of Disney’s ‘Glow with the Show’ light-up Mickey Mouse ears, enjoy.