Wisdompro RFID Key FOB Protector for Car Key Signal Blocking, WP4697 Faraday Bag for Anti-Hacking, Anti-Theft Pouch

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 normal cloth 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. ( (How to use: please put your key fob into the SILVER LINED POCKET!) Size: 5.3" x 3.9" - Large enough to hold a car key fob, a few bank cards at the same time With a small metal ring, it's convenient and easy to attach