Solpro Helios Smart 5000mAh Tri-Fold Solar Charging Power Bank, Black In direct sunlight thehelios smartwill charge in 5 hours Comes with Micro USB charging cable Helios has been engineered to recognize headsets, fitness trackers, and other wearables so that theywill receive a full charge. High Quality Lithium-Polymer battery with safety circuitry Dual USB ports gives you the power to charge up to 2 devices at One time