The four features of SAVING + Card: 1. Ecological design: saving receipts in the card. There is no paper-waste. 2. The user can sign without a pen, and the signature will be send to the E-system by RFID. 3. It’s easier for the clerk to check the signature in the computer. And the receipts can be saved in the computer. 4. This design can remind users to pay the bill before deadline by shining. The new solution can reduce the amount of paper-waste, and the most important thing is you can always keep your card in your hand!