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In the room where the signal jammer is installed, using a mobile phone will find that there is no way to make calls, no way to answer, and no way to connect to the Internet, so naturally there is no way to receive information. In addition, the test room signal blocker with Bluetooth function, then the Bluetooth function of the mobile phone cannot be used. This avoids the possibility of making or answering calls with Bluetooth headsets and the like.After using the signal jammer, it is safer and more concealed. The signal jammer will not interfere with the work of other electronic devices.

The wireless network facilitates people to access the Internet, but the problems caused by it cannot be ignored.This equipment has been widely used in countries and regions around the world. Schools, prisons, libraries, reading rooms and gas stations are typical representatives.The benefits of home wifi jammer are to ensure network security on the one hand, and on the other hand, it can also control the time that children use the Internet.This is not only a problem of accessing the network, but also a problem of network security. In order to maintain a good network environment, many places have installed wifi shields to prevent excessive use of the network.

At present, the cell phone jammer used in the examination room are all full frequency bands, which can interfere with all the frequency bands of the three operators 2G/3G/4G/5G, and WIFI signals and Bluetooth signals can also be shielded. The above is the principle of mobile phone signal jammer. However, the frequency band of electromagnetic waves ranges from a few Hz to several hundreds of GHz, and each segment may be used as a communication signal. Will there be some special frequency bands that are used in the examination room? This is true for other radio communication tools, and radio communication tools with dedicated frequency bands "came into being" in this context.