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First I tested this with my gym key card, but it still beeped me in the door. I read on a similar product page that these types of sleeves don't block frequencies used by many key cards, which is 125MHz. My card is an HID Proximity which in fact uses that frequency. I found that passports use 13.56 MHz as do some public transit cards. So I used an NFC app on my phone to repeatedly test my public transit card. Without the sleeve the phone was able to scan the card. When it was in the sleeve, it couldn't. I didn't test with a passport because I don't trust that the app won't save or transmit personal data even though it says it won't. At the moment the only passport I have available to test is my mother's. She's going overseas in a month, and I don't want to risk her data. When I go back to my home, I can use my own passport to test the sleeves if I feel adventurous.
So I'm confident this blocks the radio frequencies used by passports (13.56MHz). I don't know about credit/debit cards since I don't know what frequencies they use. And I don't have an RFID credit/debit card to test.
These do not work. Let me repeat. They do not work. Never leave reviews, but when something plain and simple doesn't do the fundamental job, I have to say something. Took these sleeves and put my company door card in them, and tried multiple doors. For unlocked every time. Actually felt they worked better. As we have two exterior doors that are a bit glichy, and the card in the sleeve worked great. Maybe it might be a good idea to market them as RFID boosters.
These are a semi stiff silver plastic material similar to the static bag that computer parts are shipped in. The material used for those computer bags blocks every kind of radio frequency.
There are ridges around the edges extending the size of the sleeve, making it a tight fit in my wallet. There are ones on the market that are much closer to cloth or paper and do not have seals around the edge.
Pay a little extra and get some of the more expensive ones.
I don't know if it works first off, no way for me to test it. It is super thin, but the thing that bothers me the most is that it does not fit in the credit card slot in my Husbands wallet or in mine. We have to put our cards where we put our cash so it makes things less secure.
I assume these work as stated but I found the slightly extra size they made credit cards (and our passports) kept the passport from fitting in a newly ordered money belt and the credit cards from fitting in the wallet. I kept the credit card in the sleeve in my front jean pocket when in public for several days but the card took four or five seconds to insert because the circular cutout on the sleeve lip (that's supposed to give some help in inserting), was cutout on both sleeve sides, not just one and the sleeve had to be separated with a fingernail or some such to get the card insertion started. As a male with not much of a fingernail, this just got to be a little tedious as often as a credit card is pulled out on a trip, and I eventually just gave up on the sleeve, not feeling the need for it anyway. The order was as pictured, just something we didn't use for the above reasons.
Used to hold my credit/debit cards and passport. Because they have an edge the is slightly bigger than a credit card, they fit very snugly in my wallet. You have to take time to separate the opening of the pouch as they stick together. You have to rub to get the pouches out of your wallet slots and also to put them in. Works better for the passport because it is thicker than a card and keeps the opening of the pouch separated. Good quality plastic holder Quality construction just a bit too wide