Specially designed and stitched to block RFID signals in the range of 10 MHz - 3 GHz Convenient and portable - inner silver layer blocks signals, outer Oxford cloth black layer can be used as a normal case - a modern and fashionable design Block Car-key FOB Signal - Keep your car's security system from getting hacked.Double lining enhances RF signal blocking function! Size: 5.3" x 3.9" - Large enough to hold a car-key fob, a few metal keys, and credit cards, debit cards at the same time With a small metal ring, it's convenient and easy to attatch
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