The installation of mobile phone jammer in prisons is nothing new. This is to prevent prisoners from using mobile phones and other communication tools to contact the outside world. After the cell phone jammer interferes with the signals of all the cells, it can effectively prevent the planning of prison escape, the collusion of prisoners or other illegal work.

However, the prison usually covers a large area, and there will be many buildings in the prison, such as prison building, canteen, teaching building, etc. there will be many prison rooms in the prison building. Then, should the mobile phone jammer completely interfere with all places in the prison?

For the signal interference of the prison, it is first divided into indoor area and outdoor area. As the prison itself is a very special environment, prisoners use mobile phones in a sneaky and cautious state. Prisoners will not use mobile phones in public places. Therefore, mobile phone jammers do not need to be installed in outdoor areas, public places, places where prisoners gather and some areas monitored by surveillance cameras. What is really needed is those indoor areas and some hidden spaces, such as toilets, bathrooms, warehouses, etc., especially for room signal interference in the prison.

When interfering with the signal of the prison room, the low-power indoor mobile phone jammer is generally selected, which is usually installed in the corridor, and the interference signal is transmitted to the room through the door and window of the prison. However, it should be noted that if the door of the prison is made of metal, it will produce very large signal attenuation, so it can not completely rely on this installation method.

If, as the competent authority of the prison, it is decided to fully cover the interference signals indoors and outdoors, then it is necessary to choose the high-power mobile phone jammer outside the room. Their installation positions are usually installed near the fence (fence) around the prison or on the watchtower. The high-power mobile phone jammer adopts a fixed antenna, and the transmission direction of the antenna is all towards the interior of the prison, which needs to be installed in multiple directions at the same time, so as to ensure that the signal interference in all prison rooms in the prison can fully achieve the effect.