Solar Charger,PowerGreen 21W Folding Solar Panel Charger for All 5V Digital Cell Phones,Emergency Camping&Hiking(Green) High Conersion Efficiency: SUNPOWER mono-crystalline solar panel increases conversion efficiency up to 24% which is much higher than common solar panel charger. Fast Charging Technology: Automatically detect & adapt to your USB powered devices to provide the fastest charging speed. Highly Portable: Foldable design for easy carry and transport, water resistant to endure all weather conditions, great for nature trips, hiking, picnic, sailing or other outdoor activities (Water resistant for the main body of the panel, not including the USB output ports) Slim and Powerful: 1/3 lighter than the same power of solar silicon. The total power increased by 1/3 in compare with the same solar panel size; eye-holes enable easy attachment to backpacks while hiking; Portable and frame design fits for outdoor and indoor use. High Quality ETFE material with high temperature press process make the item very thin and light. Just like the paper.Please contact us anytime if you have any question during your purchasing or using.