Whether it’s Taylor Swift’s Eras Tour, Coldplay’s World Tour or a BTS K-Pop show, light-up wristbands or light sticks have become an expected part of the concert experience.

WSJ goes behind the scenes with PixMob, a leading concert LED company, to see how they use “old tech” to build creative light shows, essentially turning the crowd into a video canvas.

0:00 Wristbands at Live Events
0:47 Radio Frequency
2:57 Infrared
4:42 Bluetooth

Tech Behind
'The Tech Behind' explores the amazing engineering, computing, science and algorithms that power our favorite tech.

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