1, in the college entrance examination, in order to prevent the examination room in order to prevent some people carry some cell phones or electronic devices to cheat, as well as high-tech cameras and transmission equipment, will open a small shield. In every college entrance examination place, there is this kind of shield opened.
2, the college entrance examination center signal shielding is really useful. Generally speaking, these "black science and technology" cheating means, no matter how the principle, can not be avoided to candidates in the examination room to send and receive messages, and the two also need to be in a place with a signal can be executed.
3, cell phone signal shielding instrument is the use of the latest Israeli interference technology, to produce a fixed electromagnetic signal, covering the mobile communications GSM, CDMA, GPRS, city phone, small smart phone bands, so that the cell phone can not be used in some specific places, so as to solve some of the negative impact of cell phone signals due to the current life.
4, cell phone signal blocker as the name suggests is a device that can block the cell phone signal. Cell phone signal blocker will block mobile, Unicom, Telecom 5G signal, some devices will also block WIFI and Bluetooth signals.
5, the high school shield can control the diameter of about 40 meters. Common cell phone signal shield on the market, the role of the frequency: 869 ~ 894MHz; 825 ~ 960MHz; 1805 ~ 1880MHz and 1900 ~ 1990MHz and so on. The role of the frequency band for CDMA800, GSM900, DCS1800, PCS1900.
6, shielding cell phone signals can be reasonably avoided use of cell phone fraud situation, and thus avoid all fraudulent personal behavior. Generally speaking, the jammer efficacy scope half via within 25 meters, idealized situation a machine and equipment can provide 100 square meters of total area of interference.