The Cell Phone Signal Jammer For Classroom in the exam room is full-band. It can shield all the 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under all the three operators of China Mobile, China Unicom and China Telecom. Its principle is to interfere with its own frequency. The mobile phone receives the frequency sent by the base station and the wireless router, so as to achieve the purpose of shielding them. This cannot be avoided by cracking the number and band, because no matter which number or band you use, it is within its shielding range. There is also Bluetooth software that is not acceptable, because its frequency will also be blocked by mobile phone jammers. The only way is to install a cell phone signal amplifier near the place where the cell phone signal jammer is used to counter it. cell phone jammer Every classroom in the examination room will be plugged in during large exams, and then the classroom will not receive the signal
The so-called mobile phone shielding is nothing more than shielding wireless signals. Since it is not an iron cage outside the examination room, its principle is not shielding, but interference. The size can be completely shielded). Since it is interference, there are two types, one is full-band interference, and the other is selective interference. The whole frequency band Cell Phone Signal Jammer For Classroom is impractical, I don't believe that it is irrelevant, after all, it cannot control the range of interference; there is also the military, and it will not let a small examination room mess up. Selective interference will avoid some sensitive frequency bands, such as military and police use. In addition, GSM uses the 900 and 1800 frequency bands, CDMA uses the 800M frequency band, and Xiaoling generally uses the 1900 frequency band. I don't believe it can all interfere.