[WHY YOU MIGHT NEED ONE] These Faraday bags effectively protect your car and your privacy. Lanpard signal blocking Faraday bags protect your belongings from EMF, RFID, and other hacking signals! Effectively prevent your keyless key fobs or phone from being used remotely. Protect your personal and financial data by preventing RFID scanners and readers from detecting your card's RFID signal. [MULTIFUNCTIONAL] It can also be used to protect pregnant women from radiation, for storing ID cards, bank cards, etc. If you don't want to answer the phone, you can put the phone in the bag, after which the connection will be disconnected; this bag can also block the GPS signal of mobile phones to prevent tracking and protect your privacy. [CONVENIENT & PORTABLE] Inside are two layers of signal-blocking shielding material; the outside is made of high-quality carbon fiber material and can be used as a regular phone case. Waterproof, blocks phone calls, SMS messages, Wi-Fi, Bluetooth, 5G, RFID, NFC signals, etc. A modern and fashionable design. [2 PIECES CARBON FIBER FARADAY BAGS & PRACTICAL] Faraday cage protection, dimensions 10.5 x 21 cm, easy to carry. This anti-hacking case holds phones and more car keys, protecting your car and phones from hackers. Protect your property and privacy. Suitable for smartphones up to 17.2 cm. Includes 2 large Faraday bags per pack. PS: This anti-theft case has a keychain that you can hang on your bag.