What is a Faraday Pouch ? It is a structure that blocks the passage of radio signals. Why do you need the Faraday Bag? Every 43 seconds a car is stolen in the US, which is close to a million vehicles per year. Thieves are now more sophisticated than ever, opening and operating your car without needing to break in. Using “signal amplification” to gain unauthorized access to your car, these thieves can steal your car with total ease. This faraday cage can block ID card, bank cards, etc. Fits for car key fob, compatible with Ford, Toyota, Honda, Cadillac, Nissan, Chevrolet, Ram, Jeep, Audi, Benz, BMW, Subaru, Hyundai and Kia, etc. Protect your money! How does the GOODEN ATIM key fob protector work? Our faraday case make your cars safe by stopping signals being sent or received by your key fob or any other device containing data. Remove your key from the faraday bag and signal reception is restored immediately, enabling normal usage. Attention 1. The size of these Faraday bags is only designed for car key fob, not suit for mobile phones. 2. Please do not wash the faraday pouch; keep the interior dry,or it may lose signal-blocking function.Good radiation protection. 3. The density of our materials is better, so it is more durable and guarantees longer. Beware of counterfeit materials. Retail Package includes 2 x RFID Signal Blocking Bag.