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Provides dual USB ports, you can easily charge for two devices at the same time, or share this backup power with your families or friends. Power saving, after fully charge for your devices, this power bank will automatically stop power output and enter the low‑power state. Built‑in single crystal solar panel, ensures fast speed conversion rate of solar to electric. Supports solar fast charge, safe and environmental friendly, suitable for sport, travel, and other outdoor activities. 20000mAh large capacity, you can easily charge for your phone anytime and anywhere without worrying about running out of power.