The self-charging adidas RPT-02 SOL headphones are built in part from recycled plastics* and are designed to endure the everyday challenges of an active lifestyle. Using light as the ultimate source of energy, you're offered all the playtime you need to keep the music going. Taking time to recharge or gearing up for a workout, these sport headphones are powered by light to power your performance.*51% of the product consists of plastic of which 87% is post consumer recycled PC-ABS and recycled nylon (excluding plastics in electronic components)