The mobile telephone signal isolator will offer safe and clean space for you, and it will become a sincere guard that you can believe. The operation mobile telephone signal isolator has been authenticated and got certification from the National Secrecy Bureau Information Safety Product Inspection Center, Science and Technology Harvest Appraising Commitment of the National Secrecy Bureau, Shenzhen Electric Product Quality Inspection Center, Chinese Liberated army Information Surveying Center, the National Anti-explode Electric Production Quality Inspection Center, the National Secrecy Bureau Electromagnetic Leak Emission Defending Product Inspection Center, Electric Product for Police Safety and Warning Quality Inspection Center. This product is suitable for where forbid to use mobile phone. One: Summary With the high-speed development of communication technology in the information times, mobile phone has become indispensable tool in daily work and life of people. But the wide use of mobile phone has also brought some un-neglected problems. Mainly as following: 1. 1 It becomes a new secret leak channel and brings danger to secrecy information. With the development of science and technology, the orientation, track and scrutiny to mobile phone have become the most important recon measure and source of information. So taking a mobile phone in a privacy price, whether using mobile phone or not, if only opened, it will leak out secret and bring serious danger to enterprise, personal, even to Party and country. 1. 2 It becomes a new source of noise and brings trouble to natural working system. The increasing prevalence of mobile phone make the environment of meeting room, court, library and school deteriorated. The sound from mobile phone damage the quiet and grave atmosphere of these places and make bad impact on the operation of daily work. 1. 3 It becomes a new unsafe factor and brings bad impact on the safety of enterprise. There will be fire or explode when using mobile phone in gas station, oil field or store and the result will be very serious. 1. 4 It becomes a new commit measure and brings bad impact on the safety of society. Some gambled people make use of mobile phone to cheat in the exam, some terrorist and hostile eve