The RAVPower 15 W Solar Charger with Dual USB Port uses a high conversion solar charging technology to keep your devices working with solar energy. It features 2 ports with a maximum of 3A total output to charge 2 devices at the same time, and its iSmart technology guarantees 100% compatibility and quick charging speeds. It has a foldable design that is easy to carry with you and is also made from water-resistant and mold-resistant nylon for durability in any weather.