AOZBZ4 Pack RFID Blocking Cards, Contactless NFC Credit Card Passport Protector Blocker Anti-theft RFID Blocking Card for Men & Women (Type 2)

Bought this for my recent trip to Europe. Put it in my wallet and my wife's, as well as in passport pouch. It is more of for peace of mind. I like it that it is credit card size and can easily fit into any wallet, not bulky, and I can still use my old wallet. Not sure how long it would work, but so far so good.

This review is of the four pack of AOZBZ RFID blocking cards.The important point is that these cards actually do prevent the reading of the data by NFC from your credit card. The blocking card should be stacked directly in line with your NFC enabled credit cards. I tested it with my Flipper Zero and even with the credit card directly on the Flipper Zero and the blocking card about 1/2" below the credit card the blocking was successful. If the distance is increased or if the cards are not well aligned then blocking is less effective.However, there may be little to no need for these cards. USA passports already have RFID blocking in their covers so they can only be read when the booklet is open. Credit cards will supply the card number and expiration date by NFC but those are of somewhat limited use by criminals for fraudulent transactions without the CVV code and mailing address. Credit cards also supply a unique and changing number for each transaction so even if that value is captured it's only useful once.