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Card Balance Checker directly display the balance on the phone case so we can check the balance all the time. People often forget ticket card when they in a rush because it is too tiny to be remembered. Card Balance Checker put the electronic ticket card between smart phone and phone case. Most People would’t forget their smart phone these days. If we put the ticket card with smart phone, we will not forget to bring the ticket.
Shih Chien University
Taipei, Taiwan
Ziren Lee,
Shih Chien University