Faraday BagGPS RFID Signal Blocker Pouch Case Bag for Cell Phone Privacy Protection and Car Key FOB (Black) &#x1f4bc FUNCTION &#x1f4f1 Anti-radiation, anti-degaussing, anti-signal. It can be used to prevent the signal relay hack (blocks thieves from copying or boosting your wireless fob code to enter your vehicle) and protect your privacy. &#x1f4bc Anti-signal &#x1f4f1 Shield cell phone signal: If you don't want to answer the phone, you can put the phone in the bag, then the phone will tell "Calls can not be connected." Shield GPS signal : Prevent people from being tracked. &#x1f4bc Double-layer structure &#x1f4f1 The inner layer can be used for items such as mobile phones that need to be shielded, and the outer layer can be used for other small items The middle of the inter layer is thickened (with a layer of soft sponge) to prevent the inner cell phone from being scratched when the key is placed in outer layer. &#x1f4bc Convenient and portable &#x1f4f1 The Faraday Bag has used Velcro buckle for easy opening and closing ;and it is easy carrying and not easy to lose because it has a rope. &#x1f4bc High Quality &#x1f4f1 Made of high-quality Oxford fabric, it is fine workmanship and durable.