Features 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. High 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. 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 enable easy storage and carrying. Well-placed eyelets allow easy attachment to backpacks, trees, or tents. Convenient Storage Pouch The sewn-on zipper storage pouch provides a convenient place to hold your device and USB charging cables, and keeps your device out of the wind or direct sun while charging. Safe Reliable Built-in over charging, over discharging, over current, and short circuit protection keep you and your devices safe. Flexible Adjustable The drawstring and the collapsible holder let you adjust it to different angles flexibly in order to absorb sunlight efficiently.