Smart Wristbands Let DJs Read the Audience

DJs can now get real-time feedback from the crowd using Lightwave. Created for use at concerts, Lightwave is a smart wristband worn by audience members that measures movement, audio levels, and body temperature. These measurements are fed to the DJ in real-time so he or she can determine how many people are dancing,  if  people in the back can hear the music at that particular moment in the show, and if the audience is engaged.

More information: https://futurevision.rga.com/2014/03/smart-wristbands-let-djs-read-the-audience/