RFID Journal Staff asked 7 years ago For example, in cards used by occupants of a condominium…?
—Pat
———
Pat,
There is no battery in the cards used to enter a building. The reader emits radio waves, which the transponder in the card captures and uses to reflect back a signal. This is what is known as a passive RFID tag or transponder.
—Mark Roberti, Founder and Editor, RFID Journal
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