rfid blocking id badge holder (holds 2 cards) - skimsafe fips 201 approved - dual sided shield blocks 13.56mhz radio signal - specialist id (royal blue) specialist id protect your personal information and your rfid card with a skimsafe card holder. made of rigid hard plastic with double sided capacity to display or keep your id credential handy and accessible. your magnetic strip or chip cards can easily be removed or partially slid out to allow access at 13.56mhz rfid checkpoints. reinsert your card to help block the rfid signal from being skimmed. <br> <p> these durable holders work best with a vinyl strap clip or plastic hook attachment to any lanyard or badge reel and can be hung either horizontally (landscape) or vertically (portrait). plastic tab inserts keep your name cards from falling out when inside the protector case. a two badge holder is very ideal and practical for government , military, federal, security, police, it specialist, hospital staff, banking and airport employees who always carry 2 smart cards. useful with cac cards, credit, debit, drivers license, transit ticket, cruise id, passport card, hotel key, work badge, prox, building entry badge, park passes, parking pass and more! so many possibilities and reasons to have one or more... plus they make great gifts for coworkers as well.