Anti-theft Spigen Pouch Keyless RFID Signal Blocker - blackSecure your keys with a Spigen brand case! The anti theft RFID case, or the Faraday Cage, is a professional protection system for owners of cars opened using the Keyless system. Keyless Go keys allow for convenient, remote opening of the car, but are also susceptible to break ins and signal theft. A specially designed case blocks the transmission of radio waves between the keys and the car, thus protecting it from theft by a potential thief. Spigen