Toptekits D39 Case Bag RF Signal Isolation For Forensics Signal Blocking, Anti-tracking, Anti-spying, Radiation protection for smart phone Cell Phones, Key Fobs and Credit Cards Dimensions: 12.2X 6.1X 0.5inch ,for smart phone,key fobs and credit cards Fold and seal the water-resistant bag to block GPS, cell signals, satellite, and bluetooth frequencies Radio frequency shielding spec: 68dB - 82dB attenuation from low MHz to high GHz High quality materials and construction protects fabric and lengthens life of bag