This high-tech instrument is capable of isolating all sorts of signals within twenty-meter scope in the space, and makes the mobile phone losing its ability to sending and receiving signal. Such instruments are widely used in those quiet and confidential occasions as the conference rooms of armed force, exam and governmental agencies and other secrecy, and locale of Director of Boarder meeting, scientific research units, training center, press conference, theater, music hall, church, hospital operation room, patient'

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