This video shows an amazing new type of light show at a recent Coldplay concert. Each audience member is given a wristband containing LEDs. These are controlled centrally so they light up in time to the music – a trully interactive experience.
Each wristband has a receiver, which allows data to be sent via radiowaves from a transmitter attached to a computer.
Showing the video would make an engaging start to a lesson on the uses of radiowaves.