Power Bank Book Style ThinBook Style Power Bank with large capacity of 20,000 mAh enough to charge your Smartphone 300% and your Tablet 200% and still have some left. This new technology using the same batteries found in Smartphone that fits ins slim style case. The Li Polymer battery packs a lot of power in thin footprint. It has Dual USB Port that can simultaneously charge 2 devices and it has power indicator telling you what is left in the power bank. It has a on and off
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