About this item Security: The Smartest RFID Protection Solution, just Insert it into your wallet, it can protect all your cards from scanning and data theft. Effective protection: Our blocking card operates at frequency of 13.56 MHZ, which protect all our cards from scanning. And the card disrupts radio frequency signals within a 5cm diameter (2.5cm each side of the card). It is very easy to protect your entire wallet. No Batteries Required: With an antenna and chip in the blocking card, it can identify any scanning instantly by sending out a scrambling signal. There's no need for any batteries. Take it with you: Our cards are ultra-thin, 1.2 mm thick cards can be easily inserted into any wallet pocket or even jeans pocket! Simply place your RFID blocker near your credit card to ensure full RFID protection. What You Get: 2 RFID/NFC Blocking Card.