Is there a shielding device in the computer examination room of the crew examination center of Hebei Maritime Safety Administration?

With the development of the Internet, the phenomenon of students cheating with mobile phones is becoming more and more serious, so the Education Bureau stipulates that school examination rooms must be equipped with mobile phone signal shielding devices as much as possible.

Mobile phone signal shields are all full-band, which can shield all 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals of China Mobile, China Unicom and China Telecom. Its principle is to interfere with the frequencies of mobile phones receiving base stations and wireless routers through their own frequencies, so as to achieve the purpose of shielding.

So as long as the screen is on, the phone can't answer the phone, send text messages or surf the Internet.