Toptekits D33 Case Bag RF Signal Isolation For Forensics,RFID secure sleeve, Signal Blocking, Anti-tracking, Anti-spying, Radiation protection for smart phone Cell Phones, Key Fobs and Credit Cards Dimensions: 9.84X 4.92X 0.5inch ,for Car Key Signal Blocker Case ,smart phone ,cell phone,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 Shields cell signals bluetooth RFID GPS Wifi ......more.for the strongest shielding in the industry