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We always meet some awkward situation when we stay outside with our cell phone batteries or computer go without electricity. At this moment you'll anxiously, especially when you are on the road to meet someone, or in the suburb for help and therere few pepole. Maybe you will cry out,but nobody will hear that . This design is easy to operate .When were travelling outside ,you only need to fix the roller and wheels together. It will charge your battery and the charger automatically, while the kinetic energy convert into electrical energy through the friction of the roller and wheels.