Credit Card Protector With LED Light - 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. Slide this one card into your wallet for instant protection to all your other cards. Smart. LED light indicates that your SignalRed card is doing its job - blocking a scanner from reaching your RFID chips! LED light not visible at other times. 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.