EDEC Large Non-Window Size Faraday Bag- Signal Blocking, Anti-tracking, Anti-spying, Radiation protection for Cell Phones, Key Fobs and Credit Cards Forensic faraday bag designed for law enforcement digital forensics and military cell phone exploitation Large size bag: Put cell phones, GPS or tablets inside to block cell signals, satellite, Wifi, and bluetooth frequencies Proprietary ISOTech faraday fabric provides best in the industry signal shielding, you won't find better! High quality materials and construction protects faraday fabric and lengthens life of bag Radio frequency shielding spec: 70-82dB attenuation (final bag spec, not just base materials spec)