What is RFID and is it safe?

Episode 1367 (20:48)

Joe from Anaheim, CA
RFID chip

Joe wants to know what RFID is and how it works. Leo says it works by electromagnetic energy which powers it. It picks up the energy and then broadcasts a signal with an identifier number. Its range is not very far.

How can he protect himself from people grabbing his information via RFID? Leo says that there are wallets which have metal fiber in them that prevents the energy from passing to his chip and broadcasting it.

Image By No machine-readable author provided. Maschinenjunge assumed (based on copyright claims). [GFDL or CC BY-SA 3.0], via Wikimedia Commons