Solar Charger Panel,Vodool 21 Watt Portable and Foldable Dual-USB Port External Solar Battery Pack for iPhone 6s / 6 / Plus, iPad, Galaxy S6/S7/ Edge/ Plus, Nexus 5X/6P, any USB devices High Efficiency Solar Thermal ConversionThis solar charger pack built in 21 watts high efficiency sun power panel, the power conversion rate increases up to 21.5%-23.5%,while most solar panels in the market are only 15% efficiency Dual USB with Fast Charging TechnologyThis solar charger can automatically test maximum current and voltage charge; fastest possible charging speed up to 2.4A max per port or or 3 amps overall, can charge two devices simultaneously under direct sunlight. Make sure that your equipment allow 2A charging. Foldable and PortableFolding size only : 12in * 6.88in * 1.18in, and there are stainless-steel eye-holes on each corner allow easy attachment to backpacks, trees, or tents. Highly Durable and Waterproof DesignPET laminated solar panels sewn into a high-wear PVC fabric ensure its durability and weather-resistant, Great for all weather outdoor activities 100% Satisfied Customer ServiceVodool offers 1-year manufacturer's warranty for all Vodool brand products, and is committed to ensure that you are 100% satisfied with your shopping experience. Just shop with confidence!100% money back guarantee. Don't like it? simply send it back.