and here's the finished product. giovanni, tell me about the prototypes you've got here? what you see here is a fully self powered, sustainable powered headphone. it has a leather structure to it. and it will actually absorb any kind of light and convert that light into electric energy and charge the battery. if you go to the gym, whatever you do, they will always charge during the day. but the luxury of not needing conventional charging will add a chunky $50 to devices, several of which have already been created. a smart helmet can sense when it is being worn in the dark and light up automatically. here are the charging panels. one, two, three. it's actually one cell underneath. they really blend in. and this bag doubles