Technology The RFID blocking card uses sophisticated electromagnetic jamming technology frequently used in military applications. No battery The card lasts forever. The card has an extremely efficient energy harnessing technology which allows it to be powered by energy from RFID scanner. Auto-Adjust Power The RFID blocking automatically adjust power of its jamming signal to ensure your RFID enabled cards, passport etc remain protected even against very powerful RFID skimming systems. Convenience You no longer need to wrap your credit card in foil. Just keep the RFID blocking together with your cards in you wallet to ensure unmatched RFID security. Security Protects your RFID enabled cards, passport, driving licence, office door passes etc from RFID skimming (electronic pick-pocketing). Slim Our RFID blocking card is only 1.25~1.35mm thick and will perfectly fit in your wallet.