rf - Good faraday cage to block bluetooth beacons - Electrical Engineering Stack Exchange
Faraday Bag for Key Fob,Faraday Cage Protector - Car RFID Signal Blocking, Anti-Theft Pouch, Anti-Hacking Case Blocker, Signal Blocking Key Fob case(Carbon Fiber Texture) - Walmart.com
How to Make a Faraday Cage: 7 Steps (with Pictures) - wikiHow
Block uses 19th-century tech to combat smartphone addiction