◉With the development of technology,data has become extremely important,so exposed cards are very dangerous.criminals can easily steal your information.therefore,RFID protection cards to protect your privacy are very necessary for us.rfid shielded card protects credit and debit cards and some cards with chips from embezzlement and infringement by using our electronic field technology to make criminals invisible to your information. ◉With credit cards protector innovative circuit board interior,you can be sure that your card numbers,address,and other critical personal information is safe from nearby radio frequency identification (RFID) scanners.blocking frequency range: 9-27Mhz(all the cards in this range can be blocked).