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Features: Function: By creating a surrounding electronic field which makes 125 Khz, 13.56 Mhz, 860-960 Mhz cards invisible to the nearby scanners, this RFID and NFC signal protection card will become your favorite accessory. No charging: Our cards do not need charging or batteries, they get energy from the present RFID scanner, keep the card around, you will keep a bouncer to your bank cards, driver's licences and passports. Specifications: Material: PVC/ PET Size: approx. 8.5 x 5.5 cm/ 3.3 x 2.2 inches Color: black Thickness: 0.5-0.76 mm Package includes: 10 x NFC blocking cards Notes: Manual measurement allows for some slight size errors.