With the continuous development of technology, the mobile network has also been updated several times. From the original 2G mobile phone network to the current 3G, 4G and 5G mobile phone signal networks, the wireless Can Cell Phone Have A Wifi Jammer has also undergone continuous updates. Mobile phone signal jammers are mainly used for school exams, college entrance examinations and some venues where the use of mobile phones and other communication equipment is prohibited. cell phone jammer With the increase of communication network frequency band, mobile phone jammers have changed from the initial 3-way antenna to 8-way antenna shielding or even 10-way antenna shielding device to the current built-in antenna mobile phone signal shielding device.
By the annual exam season, all parties have begun to prepare for the exam, and the invigilator has various tricks to prevent high-tech cheating. Among them, the exam room special Can Cell Phone Have A Wifi Jammer is still an anti-jamming device. There are many types and models of mobile phone jammers. Before purchasing, users should clarify their needs to avoid test room accidents due to poor shielding effects. They are also paying attention to the correctness of the method of use. Most schools use test room-type mobile phone jammers that are suitable for long-term work and are durable. The second is how large are we in the shielded area? For example, if it is a room of 100 square meters or a venue of thousands of square meters, if the area is large, the Power must be larger, and if the area is small, consider choosing the shielding Power adjustable. Then there is which frequency bands need to be shielded. Are China Mobile, China Unicom, Telecom, and CDMA all shielded? Still only need to shield part of the frequency band.
