Credit Card Protector - 1 RFID Blocking Card Does All to Block RFID / NFC Signals form Credit Cards and Passports; Fit in Wallet and Purse Security. RFID Blocking Card is powered by E-Field technology, which jams and scrambles RFID \ NFC signals, protecting your personal information from unauthorized scans. Effective. One card does it all to protect all the cards in your wallet. No double cards required! Efficient. Simply slide the card in your wallet for instant protection to all of your cards. Compact. Credit card protector fits snugly in your wallet or purse for ultimate space-saving. Verifiable. Download the "NFC TOOLS" app on your Android, and watch SignalRed do its job for yourself.