Generally, for general exams and small meetings, choosing a 2W-10W cell phone signal jammer will achieve good results. However, according to our investigation of major schools and important meeting places, many places are often one-sided pursuit of high-power jammers. For example, a school with more than 20 classrooms installs a jammer in each classroom and selects them. It has a 30W transmission power, and after the test, due to inadequate use, a small number of shielding devices are not closed in time, and the transmission continues for several weeks.

The frequency jammer transmits interference signals through broadband to interfere with the mobile phone signals. It is a signal emission source in itself. There is radiation in nature. The current use needs, its transmission power ranges from 1W-480W, you can make a comparison, the maximum transmission power of GSM mobile phones is 2W, and the usual transmission power of GSM macro base stations is between 20W-40W. The transmission power of the shielding device generally used for examinations and meetings is between 10W-60W.

The mobile phone signal jammer is produced to reasonably avoid and interfere with mobile phone related signals, such as GPS, WIFI, 2G, 3G, 4G, or 5G in the future. It is mainly used in school examination rooms, prisons, detention centers, etc., in order to ensure fairness and justice in examinations, high school entrance examinations, college entrance examinations, or usual mock exams. So how to choose a signal jammer? From the manufacturer's point of view, if the choice is not appropriate, it is easy to cause the product to be returned or replaced, or the installation has no effect.

Most schools use test room-type mobile phone GSM jammer 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 shielding? Still only need to shield part of the frequency band.