These girls came up with a solution for creating and storing energy from physical exercise. You put the sensor on your body, like on your foot, and then you move, dance or run and it saves the energy that you yourself create. It has an attachment on the head that lights up to show the world that you are creating your own energy - and using it to listen to music for instance. So, it also works as a positive energy transmitter that will inspire more people to move and create energy.