So your devices aren't at risk of remote access and control. Protect your car keys and credit cards with this signal blocker case. Keeping you safe in the home and on the move. With Faraday cage lining that prevents RFID, NFC, Bluetooth, GPS/SatNav networks, 2,3 and 4G mobile phone and WiFi connectivity, Multiple slots to safeguard all belongings including key fobs and other smart items that hold electronic data. | Car Key Signal Blocker | Wowcher