RFID Key Fob Protector ==These Faraday Bags can effectively protect your car. Faraday Bags protect your belongings from EMF, RFID and other hacking signals! Effectively prevent remote access to your keyless entry fobs. No longer worry about thieves amplifying your fob signal and opening the car. Blocks signals == The Faraday cage protector is made of premium carbon fiber and military grade RF shielding fabric , waterproof which can block WiFi (2.4 and 5 GHz), Bluetooth, GPS, RFID, car key signal, etc. Simply place your key in the closed Faraday bag to prevent thieves from picking up and relaying signals from your key, protecting you against break-ins and keyless ignition theft. this pouch Convenient Faraday Keychain is the perfect size to protect your keys, embedded access cards, or other small electronic devices such as a garage door opener or smart watch. Please check the model and size before purchasing. Note: The data is all manually measured, please allow 1-3cm error due to differences in light and display, it may may be color differences, please refer to the actual item received.