JAMMING CHIP: An antenna and jamming chip makes up the main components of the card. The antenna will sense incoming radio waves and draw power for the chip to create a jamming signal. Lifetime usage as the card does not require battery. BROAD WORKING DISTANCE: A large working distance of 2.4” provides complete protection for your whole wallet. Cards 1.2” either side of the card will be fully secure from e-pickpocketing. ULTRA-THIN & COMPACT: At the size of a standard credit card and at only 0.03” thick, the card will fit into any wallet, purse or card case. Keep your wallet compact with no added bulk from this card. TEST THE CARD: Test the card is working at your local supermarket. At the self-service checkout machines, combine the card and a contactless card on the payment reader. Payment with the contactless card will be blocked and an error message should occur on the reader. SaiTech IT Package Contains: 10 x RFID Blocking Card Protect and secure your ID cards and payment cards from being hacked and skimmed from the RFID and NFC readers at frequencies of 13.56Mhz. TEST THE CARD: Test the blocking card at the self-service checkout machines at your local supermarket. Place the RFID blocking card on your contactless card and bring them close to the contactless card reader. You'll find that your credit card cannot be read. (Note: It can NOT work on cards with frequency from 100KHz TO 125KHz.)