The cell phone signal jammer is designed to adequately avoid and jam cell phone signals such as GPS, WIFI, 2G, 3G, 4G or 5G in the future. It is mainly used in school exam rooms, prisons, detention centers, etc. to ensure fairness and justice in exams, college entrance exams, college entrance exams or usual mock exams.
How to choose a signal jammer? From the manufacturer's point of view, improper selection can easily lead to the product being returned or replaced, or the installation has no effect. How to Choose Jammer Shop Jammer in 5 Steps?
First, compared to the shield, the appearance is not particularly important, but the structure of the installation is different. In terms of appearance, the shield can be divided into an external antenna and an internal antenna. The external antenna has an external antenna and extends so that it occupies a larger space than the internal antenna. It's because of the antenna that extends outward. The effect of the external antenna is more stable.
Second, the power of the shielding device: the general power range is 3W to 480W, and the shielding device can generally be divided into low power, medium power and high power. The power is between 3W-100W. In general, the use of high power signal shielding is not recommended. It will seriously interfere with the base station signal transmission, and also have a certain degree of radiation to the human body. For exams, schools, court exams, etc., it is recommended to recommend some medium-powered machines.
Third, the size of the power adapter: the handheld is a built-in lithium battery, and you can use the power adapter to charge after the power runs out. The desktop examination room uses 220V power supply, and the car-mounted vehicle generally uses 12-36V power supply.
Fourth, the place of use: when used in an indoor area, generally suitable for the test room, meeting room, office and other spaces, the shielding device is low-power, and the gas station must be used in explosion-proof and high temperature resistant; If it is an open outdoor area, high power signal jammers must be used to achieve the appropriate distance. In particular, there are certain wall penetration requirements.
Fifth, the frequency requirements that everyone knows, 2G, 3G and 4G: Before you buy, you need to know which signals you want to block. Ordinary mobile phone signals (234G) can be selectively blocked by blocking only 23G or only 34G is shielded. This can be set before leaving the factory. There are also 2.4 GWIFI, 5.8 GWIFI and other frequency bands. In general, ordinary signals can be quickly shielded.
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