This is the Q-Sound, a solar-powered Bluetooth wireless headphones. The Q-Sound has a headband that is equipped with solar cells. According to the designer, Shepeleff Stephen, one hour of sunlight allows the headphones to operate for about 2.6 hours.
Like most Bluetooth headphones, the Q-Sound can handle phone calls. It also comes with a 3.5mm headphone jack. The Q-Sound is just a concept at the moment.