Secure your car: our faraday key fob bags can effectively block all signals in the bag and guard your keychain code from the digital reader, which prevent criminals from stealing signals from your key fob to access your vehicle, educing break-in and keyless ignition theft to make your cars safe Perfect Size and Capacity: This key fob protector folded size is 5.1X3.3 inches, suitable for all car keys on the market the inner pocket is for car key fob signal blocking. The outer layer pocket can be used for storing ID card, bank cards, a few metal keys, etc. This faraday key fob protector pouch is a must for your car protection.all targeting "keyless entry" cars. If you park your car outside of a garage, this shield will allow you to rest easy at night. Faraday key fob protector pouch stitching with shielded material which stop thieves amplifying your fob signal and opening car, stop your keyless entry fobs from being remotely accessed;