What device should I use to block RF signals

There are a large number of different cell phone portable jammer on the market. However, in order to obtain the perfect interference device for you, you should know some basic knowledge about mobile phone jammers. First of all, what is a cell phone jammer? Mobile phone jammer is a device designed to block all signals from a mobile phone in a specific area. It was originally developed for police and military officials, but today, almost everyone can use this device to protect their houses, offices, cars, etc. most of the time, The use of mobile phones is prohibited in many places and occasions, otherwise it may cause serious consequences. For example, in hospitals, there are sensitive devices, and mobile phones can damage it; in movie theaters, it is recommended to turn off the mobile phone to avoid disturbing other audiences; on the road, drivers should avoid talking on the mobile phone or sending messages that may cause traffic accidents . There are many other examples, but the only solution is to use a cell phone jammer to block all cell phones.