To put it simply, a signal jammer is a jammer that makes the radio, mobile phone, Bluetooth, and WiFi signal bands within a certain distance noise, so electronic devices such as mobile phones and radios lose communication signals. It's like you are in a very noisy vegetable market, and others can't hear what you say, and you can't hear what others say. Listening and speaking are useless. Schools and examination rooms use Spy Gear Cell Phone Jammer , and the effective distance is generally within 200 meters. And generally, many units are installed, repeated coverage, and shielding is strengthened. If you want to hold up a larger "shielding umbrella", you need more professional equipment. Generally, you will drive a signal shielding car. Be careful: the original mobile phone signal jammer was designed to fight crime and serve law enforcement agencies and the military. So in fact, buying signal shielding on your own is also suspected of breaking the law. The mobile phone signal jammer may be caused by criminals. Serious consequences. cell phone jammer
The Spy Gear Cell Phone Jammer used in the exam room is full-band, which can shield all 2G 3G 4G mobile phone signals and 2.4G WIFI signals of China Mobile, China Unicom and China Telecom. So as long as there is a mobile phone jammer in the classroom, all mobile phones cannot make or receive calls. Texting and surfing the Internet. The statement that signal jammers do not shield China Telecom and China Unicom is absolutely incorrect. Unless there are telecom and China Unicom signal transmission towers near the place of use, the signals of China Telecom and China Unicom mobile phones are particularly strong, and the power of the mobile phone jammer is too small and not suppressed. At this time, it may happen that Telecom and China Unicom cannot be shielded. . In addition, the mobile phone will have a signal against the wall, which is also wrong, but the farther away from the mobile phone jammer, especially the signal may leak out at the window.
