Jammers are generally used during major tests

As the name implies, the over-range device has the function of shielding the mobile phone from external communication. It sends electromagnetic waves at the same frequency as the communication signal of a smartphone. This makes it impossible to distinguish between useful radio waves and WiFi jammers. You can achieve the purpose of prohibiting the use of the phone. The jammer is mainly used for important tests. Usually, the jammer will be turned off after the test. Generally, all secondary schools restrict students from using mobile phones in school.

Many classrooms are equipped with cameras. There is a box with a width of 30 cm and a height of about 50 cm. In addition, I am writing the term “wireless signal interference”. The test laboratory installed GPS jammers at the test site during the graduate exam, CET exam and other unified exams to establish a standardized laboratory. Complete the test center, full-time signal detection at the test site, track and limit fraud.

Have you ever felt annoyed by other people talking loudly on the phone and interrupting your commute? It turns out that there is a way to end these calls-a cell phone handheld jammer is a device used to prevent mobile devices from receiving signals from their base stations. Cell phone jammers were originally designed for law enforcement and military purposes to prevent communications between terrorists and criminals. They are also common in prisons, where (obviously) prisoners are not allowed to use cell phones. After the public discovered this technology, many people (especially employers) wanted to use it themselves, especially in large cities where everyone seemed to be making calls all the time.