EDEC XLarge Window Size Faraday Bag- Signal Blocking, Anti-tracking, Anti-spying, Radiation protection for Cell Phones, Key Fobs, Tablets, Laptops and other devices Forensic faraday bag designed for law enforcement digital forensics and military cell phone exploitation XLarge size bag: Put multiple cell phones, GPS, tablets or laptops inside to block cell signals, satellite, Wifi, and bluetooth frequencies Shielded window allows preview of device inside to determine battery life, device state, and confirm signal isolation Proprietary ISOTech faraday fabric provides best in the industry signal shielding, you won't find better! Radio frequency shielding spec: 44dB - 50dB attenuation (final bag spec, not just base materials spec)