Sat beneath the surface of this helmet is a light-harvesting material, called Powerfoyle, which converts solar energy into electricity.
After cycling to work in the morning, leave the POC Omne Eternal by a sunny window to charge and by evening you should have a fully juiced red light on the back of the helmet.
Bung the helmet on and the sensors inside turn the light on too.
The back-facing light isn’t bright enough to warrant binning those bike lights you keep forgetting to charge, but it will improve your visibility to others.