Category: NEWS

All customers who have purchased mobile phone jammers are very concerned about the actual shielding effect of the shielding device when they receive the product and conduct a power-on test. Different customers must have differences in the test environment, the method of testing and the testing methods. There are also differences in the mobile phones used, so there will be large differences in the test results returned. Among them, the placement or installation position of the shielding equipment is also a key factor affecting the shielding effect. Then the question arises, if the mobile phone jammer is placed directly on the ground, how effective is it?

Usually, when the manufacturer of mobile phone jammers sells the shielding equipment, there will be a detailed installation and use instruction in the package box of the goods. Let us take the most common low-power mobile phone jammers used in indoor environments as an example. There should be special installation instructions in the manual. The first choice is wall-mounted installation. It is recommended that the user keep the installation height of the shielding device between 1.8 meters and 2.5 meters, because this height is just at a position that is not easily accessible to human hands, which can prevent future use. During the process, someone will maliciously damage the shielding device or artificially cut off the power or shut down. At the same time, this installation height also exceeds the height of almost all furniture, tables, chairs or other furnishings in the room, so that the shielding signal of the mobile phone signal jammer can be transmitted unimpeded, and the shielding signal can be covered to every room in the room to the greatest extent. corner.

If it is inconvenient to use the wall-mounted installation method, but directly place the mobile phone signal shielding device on the table, this can be regarded as a compromise method, which is suitable for short-term and temporary work scenarios. Since the height of the conventional desktop is about 0.8 meters, if the mobile phone jammer is placed directly on the desktop, the shielding signal will be more or less affected by some furniture or obstacles with a height of more than 1 meter during the transmission to the surroundings. Influenced by objects, this will actually reduce the final shielding effect.

Finally, analyze what will happen if the mobile phone jammer is placed directly on the ground: unless the room is completely empty, the tables, chairs or furniture in the room will become obstacles in the process of shielding signal transmission. More or less will attenuate the shielding signal, and this attenuation will be superimposed as the number of obstacles increases. This will seriously affect the shielding distance of the mobile phone jammer. It is the most undesirable way to use the shielding device on the ground for testing and use.

Sometimes we will receive calls from individual customers who want to purchase wireless signal jammers from us, and will specifically confess that they need to interfere with the car remote control. We will directly refuse such requests. Because in most cases, those who want to interfere with the signal of the car remote control are generally not with good intentions, and the country has already announced relevant restrictions, strictly prohibiting various sales platforms from selling interference products of car remote controls . So will the wireless signal jammers we usually produce interfere with the car remote control?

If you want to know whether it can interfere with the car remote control, you only need to know which communication frequencies the car’s remote control device uses. On the whole, although there are many car manufacturers and different models, the frequency of the remote control used for the car is not much different. Most of them use the 433MHz remote control frequency band, and a small part of the car remote control will use 100MHz- Part of the frequency band between 470MHz. When the interference signal of the wireless signal jammer includes the above-mentioned remote control frequency bands, it will interfere with the car remote control.

The normal configuration of the wireless signal jammers we produce is only for conventional signals such as mobile phones, WIFI/Bluetooth, etc. But there are also some wireless signal jammers used in the examination room. In order to interfere with the possible wireless cheating tools at the same time, some wireless signal jammers in the examination room will be equipped with 100MHz-470MHz signal interference modules. If the car is parked If there is such an examination room-type jamming device within a short distance of the location, the remote control device of the car is very likely to be jammed.

In addition, there may be a phenomenon of interference to the remote control of the car. For example, there is a wireless signal jammer near the car. However, the performance indicators of the interference device are not good enough, especially the filter of the power amplifier module and the antenna. If the isolation degree is not done well, it will cause frequency multiplied signals to appear in the frequency band of some interference signals in the equipment. Let’s take the CMDA 800MHz jamming module that is definitely configured in a wireless signal jammer as an example. Under normal circumstances, the output frequency range of this module is 865MHz-885MHz. When the 1/2 frequency multiplication phenomenon occurs, the 865MHz Divide the frequency of -885MHz by 2, and you will see that the result is exactly covered on the 433MHz frequency band of the car remote control.

Examination room-type mobile phone jammers configured in some standardized examination room projects now often put forward some special requirements for the appearance of the shielding device, including one: a working status indicator light needs to be configured on the device shell, and the device needs to be The different frequency bands in the tester have working indicator lights as one-to-one correspondence to feedback the real working status of this test room-type shielding device. Then the question arises: Is it necessary to install many working indicator lights on the casing of the mobile phone jammer installed and used in the standardized examination room? Can these indicator lights feed back the real working status?

The reason why such a requirement is put forward in some projects is that it is actually an exclusive option used by some test room mobile phone jammer manufacturers to control the number of bidding codes or exclude other similar products. It is an attempt to create some exclusive technical indicators through the appearance of the device or individual small functional differences. Although these products are clearly marked with status indicators with more than ten power frequency bands, it is not difficult to find the problem as long as they are carefully tested and functionally verified. For example: For example, the most common mobile phone jammer in the examination room with 5G signal shielding function is usually equipped with 12 signal shielding modules. Normally, there are 12 status indicators corresponding to it. In addition, it should It also includes at least one power indicator light indicating whether the host power supply is powered on or not. Then let’s distinguish carefully, what are the functions of these 13 indicator lights? The first is the power-on indicator of the host power supply, which is not difficult to understand. When the switch of the mobile phone jammer is turned on and the device receives power, the host power indicator is always on. What information is fed back by the remaining 12 indicator lights? When all these indicator lights are on, does it mean that all the 12 signal shielding modules are working normally? The real result is disappointing, because some manufacturers may just connect these 12 indicator lights to the power supply indicators of the modules. When these lights are lit, it just means that each module has received effective power supply. In fact, it does not represent whether each module is working normally. For example, some modules are indeed powered, but in fact their signal source or power amplifier has failed. The module actually does not shield the signal from being emitted, but, Since the indicator light is still on, the customer cannot know the real fault information of each module in the shielding device.

In fact, we don’t advocate that the mobile phone jammers in the examination room should be equipped with more function indicators. There are two reasons: the first reason is that too many indicator lights can not really represent the failure of each module in the device. , unless it is a circuit for fault detection and analysis for each signal shielding module, and the indicator light is wired out from the detection circuit. The second reason is that the mobile phone jammer is installed in the classroom of the examination room. It is one of the supporting protection products for the standardized examination room. It is not appropriate to make these supporting products too conspicuous. If there are many lights on a shielding device during the examination Flickering or flickering frequently due to faults, which will attract the attention of candidates and distract students.

In recent years, various drone jammers and DRONE detection and reconnaissance equipment have emerged in an endless stream, especially some large high-tech equipment integrating DRONE reconnaissance and strike, which has attracted the attention and choice of many customers. However, these special equipment usually require professional technicians to operate, and the equipment is large in size and heavy in weight, and is generally installed in a fixed or vehicle-mounted manner. In terms of jamming drone signals, these devices can emit high-power jamming signals, and the control area for drones can reach a radius of several kilometers. That being the case, is there any need to recommend customers to install portable drone jammers? If the customer is equipped with such a device, what kind of scenario will it be used in?

In some sites that need to defend against drones, even if high-power drone jammers have already been deployed, or even if drone detection equipment is installed, it is actually impossible to ensure that every An illegally hacking drone. The DRONE itself is small in size, and it can approach the target by flying around at low altitude, at a slow speed, or with the help of obstacles. Whether it is detected by radar or photoelectric instruments, there is a great probability that the detection will fail. And once the accuracy of the detection cannot be guaranteed, the drone jammer linked with it will naturally not be able to be activated immediately. It is precisely because of the reasons mentioned above that some customers have reported that in the on-site environment, often the drone has already flown in front of them, and it is clearly recognized by the eyes that it is a malicious intrusion drone. The result is: Even if the drone is right in front of you, there is no means and tools that can stop the malicious attack of the drone. When this happens, let’s assume that if the security personnel on site are equipped with portable drone jammers, will it be very simple to solve the problem?

Some time ago, there was a video on the Internet about the military conflict between Russia and Ukraine. In the video, a soldier was in a trench on the ground, facing the drones above his head that dropped bombs several times, and eventually died. Netizens and viewers are all impressed by this. Drone attacks like this are by no means isolated on the battlefield. How to solve the situation where the soldier in the video is helpless? Apparently, the fighter was missing a portable drone jammer. In that battlefield environment at that time, if a soldier carried a portable DRONE jammer with him, he only needed to complete a simple start-up action, and the DRONE above his head would be disturbed by the signal, thus losing control and unable to achieve precise positioning.

Whenever the exam is approaching or before the end of the semester, we will often receive a consultation from a student’s parent, wanting to purchase a mobile phone signal jammer suitable for home use from me. The main purpose is to help students study at home. In this section, students are prevented from being addicted to using handheld game consoles such as mobile phones or PADs to delay their learning progress and lead to a serious decline in their academic performance. We know the good intentions of the parents and hope that the children can concentrate on their studies. However, in the face of such inquiries and demands, we usually answer them briefly and refuse to provide products. Why do we not recommend families to buy mobile phone signal jammers to limit What about children using mobile phones?

First of all, analyze from the perspective of children: students have already experienced a day’s learning process at school during the day, and the self-study process after returning home mainly relies on self-consciousness and initiative, and proper learning and relaxation should be recognized. A combination of work and rest will produce a better learning effect. If students are forced to keep learning all the time, they will not be able to relax physically and mentally, coupled with the use of mobile phone signal jammers to restrict children, it will often backfire and make children rebellious, which will not only prevent children from concentrating on their studies, but even It will also make children try to find other ways to break through the limitations, or use other methods to resist learning.

Let’s analyze it from the perspective of parents: the demand put forward by parents for mobile phone signal jammers seems simple, although at the beginning it was only a request to shield the signal of the child’s mobile phone or the room where the child lives. However, these parents will immediately put forward more additional requirements: in addition to requiring cheap products, there are more restrictions and requirements on the use environment and functions. These requirements are summed up, including but not limited to These are listed here:

1. The mobile phone signal jammer purchased is best to only shield the signal in the child’s room, but at the same time keep the signal in the parent’s room, so that the child cannot use the mobile phone to surf the Internet, but the parent can use the mobile phone normally in other rooms;

2. It is best to turn on the mobile phone signal jammer without the child noticing it, or install the shielding device next to the child’s room. The shielding signal can penetrate the wall to achieve signal shielding;

3. The mobile phone signal jammer is preferably small and exquisite, with a very small appearance, can be powered by a battery for several hours or can automatically set the power-on and power-off time. The size of the shielding device is best grasped with one hand, or hidden in a bag or clothes;

4. The mobile phone signal jammer should be able to block the mobile phone number. For example, if the child’s mobile phone number is set, then only the child’s mobile phone signal will be blocked, and other mobile phone numbers in the same family can be used normally;

5. Since the houses of many families are multi-storey residential buildings, it is also necessary to consider that when using mobile phone signal jammers at home, it cannot affect other neighbors on the upper and lower floors, so as to avoid complaints from neighbors because of this;

Judging from the above requirements, some functional requirements have actually exceeded the capabilities of our mobile phone signal jammer manufacturers, and some functional or restrictive requirements are self-contradictory. That’s why we don’t recommend buying a cell phone jammer for families.

Sales of commercial miniaturized drones are booming worldwide, and there are almost no restrictions on the private purchase of drones. Cases include illegal videotaping, drug trafficking, delivery of dangerous chemicals, and even terrorist attacks or military confrontations. Government agencies, military secrecy units, judicial supervision places (prisons/detention centers), large-scale event sites, group activity sites, airports/train stations, oil depots, mining areas, hydropower stations, customs and border defense, anti-smuggling and national leaders travel security guards, etc. Strictly prevent the illegal intrusion of drones and prevent terrorist attacks caused by drones. This has brought great urgent demand to DRONE signal jammer.

The main features of small commercial DRONEs include: low flying altitude, slow flying speed and even hovering, and its appearance is very small, which is commonly known as “low, slow and small”. Moreover, DRONEs can be released at any time, quickly recovered, and can also fly between buildings at low altitude to avoid obstacles. Therefore, the effective detection and defense of DRONEs has long been a difficult topic worldwide: conventional radar Even if various technical means such as detection, optical detection, and wireless spectrum analysis are combined, they cannot achieve 100% effective discovery and identification of DRONE targets. It is often when the drone has already approached the target that it panics and thinks of looking for the drone signal jammer.

At present, the mainstream means of countering DRONEs is to install and use DRONE signal jammers, but previous products are generally large in size, require AC power supply and fixed installation, and cannot be used mobile. Even though there are some hand-held or portable DRONE signal jammers, they are still large in size and heavy in weight, making it inconvenient for users to carry them around and use them lightly.

The original intention of the functional design of the handheld drone signal jammer is to use the device directly and quickly to interfere with the discovered drones, and you can choose to “force land” or “drive away” the drones. This working mode is used as the last means of self-defense for close defense against drone attacks. The handheld structure design is convenient for security personnel to carry and put into use quickly. This will be the last line of defense for customers against drone defenses.

Such portable drone jamming equipment is required for security protection when important people travel, large-scale event sites, group gathering places, military secret units, important institutions and patrols of border posts, etc.

In recent years, the mobile phone jammer system, as an important part of the digital construction project of the detention center, has been accepted and installed by many detention centers, and has been well applied in the system. Maybe some people will have doubts. Isn’t the criminal suspect detained in the detention center not allowed to carry mobile phones from the first day of entering the detention center? Since the suspect does not have a mobile phone, why does the detention center install a mobile phone jammer system?

According to the normal detention system of the detention center, the criminal suspect’s mobile phone and some other personal prohibited items will be temporarily confiscated from the first day of his detention, and these items can only be returned when he leaves the detention center in the future. From this point of view, under normal circumstances, it seems that there will be no mobile phones in the detention center. If you don’t have a cell phone, installing a cell phone jammer system is a bit of a hassle.

However, this is not the case in reality, because in a prison like a detention center, in addition to the detained criminal suspects, there are at least: prison guards who supervise the criminal suspects, chefs, doctors, maintenance workers, etc. who maintain the normal operation of the detention center. staff etc. Among these personnel, there are many individuals who evaded or bypassed the supervision system of the detention center out of selfishness, and brought their mobile phones into the detention center without permission. What’s more, it is possible to hand over the privately brought mobile phone to the criminal suspect for use.

Once the criminal suspects have obtained the mobile phone, they will use the mobile phone to contact the outside world secretly. What kind of consequences will this have? From previous news reports, we can know that in the past, after criminal suspects communicated with the outside world through privately hidden mobile phones, vicious incidents occurred frequently. Malicious vengeance against enemies and more. From this point of view, the purpose of installing a mobile phone jammer system in the detention center is to prevent and prevent criminal suspects from using mobile phones to contact the outside world, so as to truly isolate them from the outside world.

Finally, let’s talk about another question: Does the mobile phone jammer system installed in the detention center need to achieve 100% complete coverage? the answer is negative. In fact, it is possible to divide key areas for key prevention. For example, the mobile phone jammer system should focus on some hidden places and relatively small spaces that are easy to avoid crowds and be alone. For example, some public halls, outdoor playgrounds and open areas, as well as places where surveillance can directly monitor, etc., do not need to be used as key prevention areas or even consider installing mobile phone jammer systems, because criminal suspects will not be openly in public places or surveillance The camera is down to openly use the phone.

At present, more and more prisons have installed mobile phone jammer systems, and we often receive project consultations from prisons. Some of the problems in the consultation process can be brought up for discussion and provide us with reasonable solutions. suggestion. For example: Some customers have the general requirement for the goal of building a mobile phone signal shielding project for the prison, or the final effect, that the shielding signal must be 100% effective in covering all areas within the prison wall. However, the prison wall As a boundary, office areas outside the fence, armed police patrol departments, and ordinary houses and factories near prisons should be protected from being affected by shielding signals. So, is such an overall project requirement put forward by the client reasonable? Can it fully achieve the shielding effect expected by customers? If it is not reasonable, how should the cell phone jammer system project in the prison be planned and designed?

First of all, we have to make it clear that the shielding signal emitted by the mobile phone jammer system is a radio frequency signal. The transmission and coverage of this wireless signal will affect the coverage and coverage of the shielding signal due to the directional antenna or omnidirectional antenna it uses. Covering direction and so on to control a certain range or distance. However, the control of the range or distance of wireless signal transmission can only be a macroscopic and broad control level at present, and it is not possible to achieve a very precise distance limit, and it cannot be realized with the prison wall as the boundary. It is almost impossible to achieve a wall where the signal inside the wall is completely shielded and the signal outside the wall is not affected at all. In reality, our suggestion is to first ensure that the shielding signal inside the fence can be fully covered, and a buffer zone of at least 20 to 50 meters should be allowed outside the fence. In this buffer area, the impact of the cell phone jammer system may appear intermittent.

Next, let’s discuss whether it is reasonable to require full coverage within the prison wall and no dead ends for shielding signals? Our suggestion is: each area in the prison can be divided into key areas and non-key areas. For the shielding signal of the mobile phone jammer system in the key area, the signal coverage must be all-round and without dead ends. In non-key areas, you can selectively confirm whether complete coverage is required after analyzing the actual situation. The non-key areas in the prison include: the warning isolation zone near the wall, the outdoor square and the open field of vision, the public activity area, the hall or corridor aisle and other areas where video prisons are installed, etc. The reason why it is suggested that these non-key areas can be considered not to do signal shielding, in fact, we only need to imagine, what is the purpose of installing a mobile phone jammer system in prisons? It is to prevent detainees from secretly using mobile phones. As for the non-key areas mentioned above, it is obvious that no inmates will blatantly use mobile phones in these places.

In addition, not installing mobile phone jammer systems in non-key areas of the prison can also reduce project construction costs and save investment. This does not mean that we cannot do it in terms of equipment or technical capabilities. If the prison has sufficient budget funds and is willing to spend a lot of money to build a perfect mobile phone jammer system project, we also agree very much!

For a long time, the mobile phone signal management and control system has provided strong technical support for police officers. For the identification, tracking and positioning of target mobile phones, as well as blacklist and whitelist information management and control, each functional module has accelerated to a large extent. The process of handling cases has improved the efficiency of case detection. The use of a frequency jammer is a relatively simple, direct and even crude solution, which can quickly isolate or block mobile phone signals in the target area. Recently, customers in the judicial system often ask us: During the construction of the vehicle frequency jammer project, can it be considered to integrate the mobile phone signal control system with it into a modified vehicle so that the two sets of products can be used together? ?

The customer’s original intention was to integrate the mobile phone signal control system, which has worked well in the past, into the same car when the car is refitted with the frequency jammer. In the future, when handling cases, the vehicle can be used as a carrier to achieve rapid The final result of the transfer and on-board tracking of the target. In this way, one vehicle can be used for two purposes, or the expected value can be raised higher: integrate the functions of the vehicle frequency jammer and the mobile phone signal control system, so that the respective advantages and functions of the two can complement each other and learn from each other.

However, there are certain technical difficulties in this approach. Customers may have overlooked the precautions in the past use of the mobile phone signal control system. Most of the working scenarios of the system are used in a static environment. In the process, there are not many tasks to perform mobile phone signal control. And there is an obvious difference from the working mode of the vehicle-mounted frequency jammer: the mobile phone signal control system will at least include a receiving antenna and a transmitting antenna, but a frequency jammer only has a transmitting antenna.

As far as we know, when the mobile phone signal control system is actually tested during high-speed driving, its working efficiency will be significantly weaker than that used in a static environment. The main reason for this result is that the mobile phone signal control system needs to dynamically collect the information of the surrounding mobile phone base stations in real time. When the vehicle is driving at high speed, the information of the base stations along the way is constantly switching and updating data. The frequency jammer on the vehicle does not have to worry about it because there is no influence of the receiving link.

There is also a technical problem that may be faced when these two systems are built together on one vehicle: although the vehicle-mounted frequency jammer and the mobile phone signal control system are integrated on the same vehicle, in most cases the two cannot work at the same time.

The reason lies in the detection of the receiving antenna and the signal environment of the mobile phone signal control system. Once the frequency jammer is turned on, it will continue to emit high-power interference signals, although the frequency band of some interference signals is different from that of the mobile phone signal control system. The receiving frequency bands do not overlap, but because all the receiving antennas and transmitting antennas are integrated in the 2 square meter area on the top of the vehicle, within a short distance, the strong electromagnetic interference caused by the transmitting antenna of the frequency jammer This phenomenon will definitely have a very serious impact on the receiving ability of the receiving line.

Today, in any formal or important examination process, mobile phone jammers will be installed in the examination room. The purpose is self-evident, which is to strictly prevent candidates who take the examination through technical means. Electronic equipment, wireless communication equipment, etc. cheating in exams. So every few days before the big exam, we always receive some calls from time to time, wanting to know some ways to crack the blocked mobile phone signal from us. Then the question arises: if it is clear that there is a mobile phone jammer installed in the examination room, is there really a way to penetrate it?

Let’s make a hypothesis: If the students taking the test really have the ability to bring their mobile phones into the test room, and the mobile phone jammers installed in the test room were purchased within the last one or two years, and they have been troubleshooted and tested before starting the test. overhaul. In other words, these are definitely not outdated old products, because the old products probably do not support 5G signal shielding or even 4G signal shielding. Then under such hypothetical conditions, candidates should really stop trying to find any way to crack the mobile phone jammer, because once the shielding signal is launched, within its effective shielding range, there is really no way to crack it. Crack or anti-jamming.

Also based on the above assumptions, why do some candidates think that someone can penetrate the mobile phone jammer from other sources of information? The reason for this result is not difficult to analyze: the first possibility is that the test organizer did not immediately follow up the upgrade and iteration process of the mobile phone jammer, resulting in only a part of the mobile phone signals of various standards in the test room being blocked , and another part of the mobile phone signal is missed. The second possibility is that the preparation work before the test was not done well, and the mobile phone jammers were not checked one by one. Some devices may have malfunctioned, resulting in the lack of real shielding performance during the test. . There is also a third possibility, that is, the products provided by the mobile phone jammer manufacturers themselves have technical defects, such as: the transmission power of the shielding module in the equipment is too small, the frequency adjustment of the shielding module is wrong, or the mobile phone jammer itself The heat dissipation performance is not good, resulting in frequency shift of some shielding modules after the equipment has been working for a period of time.

The backpack-type mobile phone jammer has been recognized and used by many customers in recent years. Because of its small size, it is easy to carry like a normal backpack. It can be turned on and started at any time when performing tasks. And provide effective security for the task of signal shielding, but it is precisely because of the appearance of the backpack that it is usually carried directly on the back by the combatants, so a small number of customers will ask questions: from electromagnetic radiation From the point of view of safety, I am worried that this kind of high-power mobile phone jammer will harm my health, then, is this really the case?

In fact, the concerns of these customers are not completely superfluous. At present, the transmission power of the backpack-type mobile phone jammer and the transmission power of each shielding module are about 20W, and a device usually includes at least 8-12 such shielding modules. The overall calculation Down, the transmission power of the whole machine will reach about 200W. When the staff performing tasks carry such mobile phone jammers on their backs, the multiple transmitting antennas on the upper end of the device are closer to the head or limbs of the human body. From the perspective of visual perception, it is indeed unavoidable to remind people whether such a short distance will affect their health.

However, in the actual use or task execution process, our backpack mobile phone jammer has never been required to be carried on the back of the staff before it can be turned on. The reason why the backpack-style design is adopted is only for the convenience of carrying and quick transfer. When it is necessary to rely on high-power mobile phone jammers to cover the shielding signal, it can be completely removed from the back of the staff, and then placed It can be placed on the ground, on a desktop or in other places suitable for static placement. At this point, there is no need for the staff to stay near the device all the time, and they can temporarily stay away from mobile phone jammers before turning off the device. Therefore, when we understand the real usage scenario, we can tell customers that it is almost unnecessary To worry about whether it will harm your health.

Movie theaters, opera houses and other venues for screenings and performances must be familiar to everyone. Many people often make plans to watch movies or enjoy opera and drama performances in their spare time. When entering the venue to check tickets, some venues will The prompt needs to turn off the mobile phone or set it to a silent state, so some friends thought of such a question: Will there be a mobile phone signal jammer installed in the theater?

In fact, many theaters have already installed mobile phone signal jammers. After the audience enters the auditorium and takes their seats, some theater managers will decide whether to turn on the mobile phone signal jammers according to the needs of the event. Moviegoers in the auditorium are actually indifferent to whether mobile phone signal jammers are installed, because these shielding devices must be installed in very hidden locations, and the audience can only check their mobile phones during the viewing process. The mobile phone continues to display the state of no signal, which indicates that your mobile phone is affected by the shielding signal of the mobile phone signal jammer.

Why do these movie theaters install mobile phone signal jammers in hidden locations? This is mainly because in the past movie watching process, some viewers did not pay much attention to the use of personal mobile phones. When showing movies, if someone operates the mobile phone from time to time, the frequently lit screen will affect other people’s viewing. atmosphere. If someone forgets to turn off the ringtone of the mobile phone or turns it on deliberately, the sudden ringtone of an incoming call or the prompt tone of a short message will seriously interfere with other people’s viewing experience.

If the same phenomenon happens in the opera house, imagine that the audience in the opera house is more pursuing the process of enjoying culture and art. If during this process, they are disturbed by the sudden ringing of the mobile phone, it will not only cause harm to the surrounding audience. Great impact, and may even seriously interfere with the performers on the stage.

Although the managers of some theaters will set up reminder signs before entering the theater to remind people to consciously set the phone to mute, but it is still difficult to avoid people deliberately resisting or being lazy, or taking chances. Suffering from the fact that there is not enough binding force to require all viewers to carefully manage their mobile phones, the managers will eventually install mobile phone signal jammers as an important technical guarantee to effectively restrain the audience’s mobile phones.