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Originally Posted by JonK
They're many chips out there not requiring those, i.e. My HOA fobs...
Mobil express fob, I don't know the exact name, some smart cards. They don't need batteries... If anyone know the details let me know. I am curious to know.
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Are you talking about the pay at the pump gas tags? Those are passive RFID tags. They use the RF signal from the pump to power it's own circuits and sends back a reply. This is not how our keys work.