It is also a special place for some special industries. On a plane, for example, when the plane is ready to take off, the radio and on-board staff will tell passengers to fasten their seat belts and turn off their phones (or turn on airplane mode) to make sure the plane can work without interference from other signals. There are also units such as gas stations or petroleum and petrochemical plants, which also indicate that telephone calls and open flames are prohibited. So why can't gas stations make phone calls? Because a large number of gasoline molecules are mixed in the air of the gas station, gasoline is easy to volatilize, so when it encounters an open flame or other substances, it will cause a spark explosion, and the mobile phone we use will release it when you fuel. Call or text. Electromagnetic waves, which collide with ions in the air, also produce sparks. Because mobile phones have the functions of transmitting information, video, recording and other functions, it is easy to cause the leakage of important information of the state and related institutions. Many countries have relevant methods and laws to restrict the use of mobile phones by some important departments or persons. Wireless communications equipment to protect national interests. For example, some places that require high confidentiality of information, such as government office buildings, military combat command agencies, financial centers such as banks or securities, and examination rooms. The most contact is the examination room. Basically every school will install Disabling Cell Phone Signal Blocker to prevent candidates from cheating. At the end of the term, simulation, college entrance examination or some qualification examinations, as long as the mobile phone enters the shielding range, it cannot be received.
Signal or signal is weak. The cell phone jammer , also known as wall-mounted smartphone signal detectors and cell phone radio frequency jammers, can generate specific electromagnetic signals that cover both GSM frequency bands. The three main frequency bands of a frequency band of CDMA limit the use of mobile phones in some specific areas that need to be shielded, such as within ten meters to forty meters, while other areas that do not need to be shielded will not be artificial. At present, there are many Disabling Cell Phone Signal Blocker on the market, but most buyers know very little about mobile phone jammers, so they will inevitably encounter some pits. How should we prevent such pits when buying mobile phone jammers? Chengdu mobile phone jammer introduces the following dry goods knowledge to you: Is there a communication base station around the college? During the entire project construction process, we often found that the signal jammers reported by customers had no practical effect. 2G3G can be blocked, that is to say, the voice call signal can be blocked, but the 4G signal cannot be blocked. In fact, the output power of each mobile phone jammer is different, generally 4G1 and 4G2, the output power is about 2W, which is 33db. If there is a communication base station within 100 meters,
