Philips TAA6219 Bluetooth On Ear Sports Headphone - BlackLight, energy, action Great sound to start your day, and solar power to keep you going! Powerfoyle solar technology charges these on ear headphones in the light, with a battery that can last up to 80 hours for use in the dark. Powerfoyle from Exeger. More light, more power These headphones charge when exposed to light, from sunlight to electric light! Powerfoyle solar cell material in the headband draws energy from the sun to charge the battery and it