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When we go abroad to travel without electricity, it is very inconvenient,
especially when we want to call a emergency phone but doesn't have the electricity , if our suitcase can generation power via using its wheels rotation, it will be wonderful. It solve the problem in electric support when we are travel at the outside.
Suitcase itself also can provide electric storage, to support real-time charging requirement, and phone is on charging and move at the same time.
National Cheng Kung University
I Jui Lee