The Credit & Debit Card Protector is like a bullet-proof vest for your wallet, protecting your information from hackers and identity thieves. The card protector is the size of a credit card and gives you military-grade protection for up to three years. It fits in any wallet, never needs charging, does not require batteries, and works with Visa, Amex, Mastercard, and Discover credit and debit cards.FeaturesIncludes four (4) card protectors, two (2) card protectors per walletFits in any walletInstalls in secondsWorks with Visa, Amex, Mastercard, and Discover cardsMilitary grade protectionLaboratory tested*Provides three years of protectionMeasures 3.4” x 2.2”*The SignalVault Credit & Debit Card Protector has been independently tested by N.T.S. (formerly Qualtest, Inc.) for Electromagnetic Interference and RFID blocking and signal protectionHow to UseRemove card protectors from packagingPlace a protector behind your credit/debit cards in the top, back credit card slot of your wallet, on each side. The large SignalVault logo should be facing forwardIf you have an ID window on one side, place a protector behind your ID and cards (always have two protectors per wallet)You have successfully installed the SignalVault card protectors in your wallet