The Vevor Faraday bag set is designed to block a wide range of signals, helping protect devices and sensitive information from tracking, hacking, and signal relay theft. This 4-pack set includes multiple pouch sizes for phones, radios, tablets, laptops, and other electronic devices. Its fiberglass and nickel-copper RFID construction is also built for high-temperature resistance and spill resistance. The foldable design with secure closure makes the pouches easy to carry for travel, work, and everyday protection.