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Size does matter, but very large is uncomfortable. To take full advantage of solar energy, you need a sufficient area of solar panels that produce enough power to fill the power bank's battery. Have you ever bought a power bank with a built-in solar charger? You will have noticed that the solar panel is almost an ornament since the surface is too small to achieve a sufficient charge. With this solar charger you can fully charge the battery of an 8000mAh power bank on a sunny day. FEATURES* Strong: Super resistant material to carry in your backpack to anywhere in the world.* Comfortable: The size of a wallet, fits easily in the bag or you can carry it hanging from the backpack.* Efficient: With 6 panels you get enough charge for your cell phone.* Safety: No battery inside. It can withstand high temperature without explode or burn. Built in Over-current/over-charge/over-discharge/short-circuit protection.* Independent: The useful life of the panel does not depend on the power bank, unlike those that are incorporated (the panel is part of the body of the power bank) * Specs: Class A solar panels >17.8% effectivenessPeak power: 9WWorking Voltage/Current: 5V/1.8A(max)Working Temperature: -4°F to +140°F (-20℃+60℃)Unfolded Size: 28.5*6*0.15in (72.5*15.5*0.4cm)Folding Size: 6*3.8*1in (15.5*9.8*2.6cm)Material: Poly-SiliconWeight: 11.2oz (320g)Works with any USB enabled rechargeable devices like: Mobile phones Android & Iphone, tablets, 5V PSP, 5V cameras, power banks, book lights, lanterns, radios, flashlights, etc.Ecologic Mart Seller. * Personalized: We are a small company aware that we work with people and not only with numbers. * Committed: We do our best to ensure the quality, usability and usefulness of our products. * Friendly: 5 years selling reading lamps with thousands of satisfied customers.