Interested to know how a card only needs to be in close proximity to send a signal to the terminal yet doesn’t appear to have any internal power of its own to send the signal? Could understand if contact was necessary to complete a circuit and data could transfer but don’t quite get how it can wirelessly send/receive data with no power source?
In: Technology
They simply use RFID chips, which are small little devices that communicate with each other over very short ranges. There’s one in the card and an RFID reader in the pay terminal that authenticates it and competes the transaction.
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