Wildtek SOURCE 15W Waterproof Portable Solar Charger Panel with Dual USB Ports FULLY WATERPROOF AND DUSTPROOF - The Wildtek Source Solar Charger is the first fully waterproof solar charger when stowedeven the USB portsso it can keep up with you on all of your adventuresno matter how wet, icy or dusty ULTRA HIGH EFFICIENCY - The Wildtek Source Panels feature SunPowers latest high efficiency solar cells, delivering a faster more a efficient charge with a more compact panelalmost 2X as efficient as competing solar chargers GET THE FASTEST CHARGE - Wildteks SmartCharge Technology will detect your device and deliver the optimum charge LIGHTWEIGHT, PORTABLE, WITH BUILT IN STAND - The Source panels were designed to seamlessly accompany you on any adventuretheyre ultra lightweight, easily packable, include carabiners to strap the panel to your backpack, and include a built in stand for optimal sun exposure and convenience FULL WARRANTY AND SUPPORT THE ENVIRONMENT - A full 2-year warranty provides you with full protection and you can feel good about your purchase, knowing that part of your purchase will fund the preservation and restoration of the planet