Emvelope: "Wallet Insert
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The Emvelope® Wallet Insert is an innovative, patent-pending product that provides a simple, convenient, and easy way to contain the wireless signals being emitted by RFID chips. Simply place the insert into the bill area of your wallet and press firmly around the edges. Close the wallet and you'll have a Faraday Cage small enough to slip in your pocket. Don't let the size and simplicity fool you. Emvelope® inserts will block RF frequencies up to 2.4Ghz. More than enough to insure your safety. Make sure to put the Insert closest to your credit cards."
