RAVPower Solar Charger 16W Solar Panel with Dual USB Port Waterproof Foldable Camping Travel Charger Compatible iPhone Xs XS Max XR X 8 7 Plus, iPad, Galaxy S9 S8 Edge Plus, Note, LG, Nexus and More High Energy Conversion: Highly efficient solar cells convert up to 21.5-23.5% of solar power into free energy. Charge up to two USB devices simultaneously and forget what it feels like to have to look for a socket COMPACT SIZE: One of the most compact solar chargers on the market. Benefit from free solar energy in a lightweight foldable format you can always carry with you no matter where you go. CHARGE SMARTER: iSmart technology automatically adjusts to connected devices and provides the optimal charging current to minimize charging time. SMART IC: Smart IC frequency technology detects all connected devices' input and distributes current output accordingly for up to 3.2A. Important Note: Please DO NOT lay the solar panel directly on CONCRETE, SAND, ROCK or other high heat conduction surfaces in direct sunlight  this will cause the solar panel to overheat and significantly reduce the conversion rate and output wattage