Whether you spend a lot of time outdoors, or you just want to be prepared for an emergency, this 15W Anker solar panel can charge two USB gadgets at once using the power of the sun. $40 is the lowest price we’ve seen on this model, and its 4.5 star review average is stellar for a product in this category. [Anker PowerPort Solar Lite (15W 2-Port USB Solar Panel Charger), $40 with code FPGR435W]

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