POWERBOOK
The Solar Charging System
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Hunter's comment
as the name implies POWERBOOK is filling like a book. which can be used to write and charge a cellphone battery that is almost exhausted. Users can charge the iPhone 6 from zero to full in just 2.5 hours, which is almost the same as that offered by an electrical outlet. Powerbook is good for use in college. can write and charger hanphone.
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Hunter: 
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