Faraday Bag prevents all electronics stored in it from receiving radio signals, including Wi-Fi, Bluetooth, RFID, GPS, and Infrared (key fobs). Works best with hardware wallets that use Bluetooth (such as Ledger, CoolWallet ), Key Fobs, Phones and tablets. Some of the main functions of the Faraday Bag are to: Protect hardware wallet from remote hack via Bluetooth Block mobile apps from tracking your location via GPS Stops RFID readers from swiping credit card and passport data Prevent data access on any electronic devices