Why you may need this These Faraday bags effectively protect your car and privacy by blocking EMF, RFID and other signals. They prevent remote access to keyless entry FOBs and phones, and help keep your personal and financial data from being read by RFID readers. Multi-use Radiation protection for pregnant women, ID cards and bank cards, and other items. If you do not want to answer a phone call, place the phone in the bag to disconnect it. The bag can also block GPS signals to help prevent monitoring and protect your privacy. Material and design Two inner layers of premium carbon fiber signal blocking material. Blocks calls, SMS, Wi-Fi, Bluetooth, 5G, RFID, NFC and more. Modern, stylish design. Size and contents Includes 2 large Faraday bags. Size 4.13 x 8.26 inches (10.5 x 21 cm), easy to carry. Fits smartphones up to 6.8 inches. Practical use scenarios - Protect your vehicle keys from hackers by blocking keyless entry signals. - Shield ID cards and bank cards from RFID skimming and unauthorized access. - Isolate a phone to prevent calls, tracking or data leaks while traveling or in public places.