What are RFID Tags?

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Exactly what are RFID tags? What do they look like? How do they work? Here is info about the Scanner Guard Card- http://tinyurl.com/Scanner-Guard-Cards Do I need to be worried about RFID tags in my credit cards and passport? I answer all these questions.

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RFID UHF ABS Metal Tag for container
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I have this one for my hard disk and I lost it what can i do please help me .
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Great vid--excited that this tech is being implemented more into events!
Can you wave a badge with an rfid chip in front of a security gate that most department stores have? I bought a pass for an event, but I'm worried mine might be fake. I have 45 days to place a scam complaint if it is fake. But if its real, would the RFID chip cause the alarm in a department store to go off?
I wasn't sure if the RFID tags took the radio waves and used them as a wireless power source, or if the radio waves bounced off the chip and came back to the emitter. It was surprisingly difficult to find an answer to that, but you explained it really well. This is super interesting.