General description These Faraday Bags are designed to effectively protect your car keys and cell phone from electromagnetic fields, RFID, and other hacking signals. They prevent remote access to keyless entry fobs, ensuring that you no longer have to worry about thieves amplifying your fob signal to unlock your car. Technical specifications Material: Premium carbon fiber and military-grade RF shielding fabric Waterproof: Yes Signal Blocking: WiFi (2.4 & 5GHz), Bluetooth, GPS, RFID, car key signals Dimensions: Approximately 18cm (7.3in) x 9.5cm (3.74in) Usage Simply place your key fob in the closed Faraday bag to prevent thieves from picking up and relaying your key signals, protecting you from break-ins and keyless ignition theft. Other information Please check the model and size before purchasing. The data is manually measured; please allow a 1-3cm error due to differences in light and display. Color differences may occur; refer to the actual item received.