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When we use cell phone while doing exercise and the battery is running out of power. it’s not convenient to bring another charger or plug in with wire. So The Motion Charger can charge cell phone easily without other charger or wire. When user do exercise, the iron ball inside will compress the machine spring. And the Motion Charger use the kinetic energy transform to electricity to charge cell phone. The cell phone bag connects with the phone plug. So it can charge without external wire.