| 摘要 |
Embodiments of a payment card (such as a credit card), a financial-transaction system that uses the payment card, and a method are described. These embodiments may be used to protect financial information stored on the payment card, while providing ease of use to a user of the payment card when conducting a financial transaction. In particular, the payment card may include a transducer that detects a physical phenomenon. If this physical phenomenon is detected, a wireless communication circuit in or on the payment card is enabled, so that the wireless communication circuit can provide the user's financial information in response to an external signal received from an external reading device (such as an a radio-frequency identification signal from a card reader).
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