RFID Card Signal Blocker - Pair Supplied as pair Helps protect against contactless fraud. Place the protectors directly against your contactless card. The card needs to be between the protectors. 2 protectors per contactless card is recommended The cards protect when directly between your contactless card and the card reader. Designed to shield up to 13.56MHz signal (typical on contactless card, membership card etc) Contactless Card Protector RFID. Insert the cards into your wallet either side of your contactless ready card RFID. The card can then help protect you against digital robbery and accidental payment. Works when your contactless card protector is in contact with your contactless card. Size: 86 x 54mm. Digital print to front and back as standard.