This is a 2m reel of the new ProfiLED. These are still a developer only feature at the moment. These are individually addressable RGB LED modules that let you program them to perform various functions. Once officially released, the profiLED system will let you customise the LED behaviour of your drone based on flight functions and other events. They can show you your current flight mode, altitude or even set them to turn to white bright when landing to help any downward looking cameras see the ground better.