| 摘要 |
A distinctive recorded sound is generated when a credit card or other financial transaction card is used at a point of sale (POS) terminal. As is common, the POS terminal includes a card reader through which the card is swiped to read data that is encoded on a magnetic stripe affixed to the card. A recorded sound may be stored in the card or in the card reader. In either case, the sound is played back through the card reader when the card is swiped.
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