Looking at ancient and modern times, at home and abroad, cheating has occurred in all examinations in the past. It is just that as skills improve, the methods of cheating are constantly updated and changed. Nowadays, with the development of technology, more and more people use mobile phones to cheat, which has become an issue that examination management departments pay more and more attention to. Cell phone signal jammers are currently a proactive preventive measure in major examination centers.

Mobile phones have indeed brought convenience to people's lives, but as the mobile phones remain with us, a lot of inconveniences have gradually emerged. Schools do not allow cheating during exams. With the emergence of mobile phones, students have begun to learn to use mobile phones to cheat, but what should they do if they cannot completely eliminate the existence of mobile phones? Gas stations are also places where mobile phones are not allowed and safety accidents may occur, but what should we do if we cannot completely restrict customers? What should I do if my cell phone ringtones are most taboo during a conference or forum lecture and I can’t confiscate them all? It can be seen that mobile phones are not only beneficial, but also add a lot of troubles to people's lives. At this time, I need a machine that can block mobile phone signals, that is, a signal blocker for phone.

The special "mobile phone signal jammer" for the examination room is a high-tech product that can actively prevent cheating cases in the examination room. The working principle of the mobile phone signal jammer specifically for examination rooms currently seen on the market is as follows: when the machine is working, a spherical invisible electric fence with a diameter of about 40 meters is formed around it. The mobile phone signal is in a vacuum, that is, the mobile phone cannot receive external signals and cannot send signals to the outside. At this time, all mobile phones placed in the electric fence are in a malfunctioning state, and the prompt tone of the mobile phone when making an external call is "· Temporarily unavailable.

The blocking frequency of the special mobile phone signal jammer in the examination room is: (1)869 - 894 MHz (2)925 - 960 MHz

(3)1780 ― 1920 MHz (4)2010 ― 2145 MHz (5)2300 ― 2485MHz

(6)2515 — 2675MHz (7)3400 — 3600MHz (8)4800 — 4900MHz

(9)5125 — 5350MHz (10)5725 — 5850MHz

Its frequency bands are: CDMA800, GSM900, SCDMA1800, DCS1800, PHS1900, TD-SCDMA (Mobile 3G), CDMA2000 (Telecom 3G), WCDMA (China Unicom 3G), 4G, 5G, 2.4G (WIFI), 5.8G (WIFI)

Its characteristic is that it only blocks all types of mobile phone signals and does not affect any electronic devices. In particular, the radio will not affect the English listening test.

Comparison between the application of "examination room special mobile phone signal jammer" and other preventive measures in the examination room

1. "Mobile phone signal jammer" is an active preventive measure: "Other preventive measures" are passive preventive measures.

2. "Mobile phone signal jammer" can actively control all mobile phones entering the examination room and prevent them from being used normally: "Other preventive measures" only monitor the use of mobile phones.

3. Cell phone signal jammer” is to force the cheater to stop; “Other preventive measures” is to catch the cheater on the spot.