High Conversion Efficiency: Sunpower solar panel 22%-25% Conversion efficiency rate is higher than the normal 15% and provide more power for your deviceBuilt-in 8000mah Battery: Built-in battery could store the power which help charge your device when there is no sunlight.About 8-10 hours to fully charge under 70000lux light condition4USB Output: 4 usb port in this pack allow you could charge 4 devices at the same time,compared with the common 2 usb ports in the marketPortable and Compact Design:Compact size(13.38x7.0x0.79 inch folded or 22.8x13.38x0.39 inch unfold, 29.5oz),stainless-steel eyeholes,PET laminated technology, high temperaturescratchshock resistant PVC fabric with surface grinding processing are designed for outdoorsPackage Contents: 21W Foldable Solar Panel Charger, Carabiner, micro USB cable, instruction manual, 18 Month Worry-free Warranty and friendly customer service
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