Shield and protect personal data with these RFID credit card covers. Ideal for use in any wallet or purse, when placed on top of a credit card they block illegal scans of RFID chips embedded in modern-day cards, shielding data and preventing identity theft. Furthermore, `Card Guards` also prevent 2 contactless cards in the same wallet being billed simultaneously.RFID means Radio Frequency Identification. Personal and banking information is stored on RFID chips in passports and credit cards. Criminals can easily scan these chips from a distance, taking the information like a digital ‘pick-pocket’. This allows them to perform identity theft and other digital crimes.