| 摘要 |
A card having radio frequency identification (RFID) tag receives a first electrical signal having a first message sent by a RFID reader and returns a second electrical signal having a second message to the RFID reader in response to the first electrical signal. The card having RFID tag includes a coil, a microprocessor chip, a switch, and a display. The microprocessor chip is disposed in the card and electrically connected to the coil. The switch is disposed between the coil and the microprocessor chip. The display is controlled by the microprocessor chip to display the first message or the second message. The switch is used to control whether to start the RFID tag or not, and then the display displays the transmitted or received message, so as to protect data from being stolen and efficiently control the transmitted and received messages. |
