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A Faraday bag functions on the principle set forth by Michael Faraday in 1836, which states that a conductive enclosure can shield its contents from external electric fields. Faraday bags are usually made from materials that have conductive properties, most commonly aluminum foil. These bags effectively block electromagnetic radiation, preventing unauthorized signals from entering or leaving the bag. They can come in various forms, from simple DIY solutions made from aluminum foil to commercially produced, multi-layered insulated bags.