dodocool Solar Charger Foldable with 10000 mAh Dual USB Port Power Bank Battery Built with SunPower Solar Panels [10000 mAh Battery Capacity] Internal 10000 mAh lithium polymer battery, rechargeable via solar panels, is ideal for charging your smartphones, tablets, GPS or other USB-enabled devices. With 4 LED lights to indicate battery levels. [High Efficiency] Built with 12W SunPower polysilicon solar panels, its maximum solar conversion efficiency is up to 22%. Great for providing power to charge two devices simultaneously while converting extra sunlight into energy and storing in the built-in battery. [Dual USB Ports] Automatically detect your device and deliver the fastest possible charging speed up to 2.1 amps per port or 2.1 amps overall. During solar charging, it charges connected devices first. [Foldable & Portable] Compact size and foldable design enables easy storage and carrying. Well-placed eyelets allow easy attachment to backpacks, trees, or tents. [Seller Warranty] 30 Days Money Back Guarantee; 18 Months Replacement Warranty; Lifetime Product Support Guarantee; 100% Customer Satisfaction.