​First, you need to explain to the communication jammer equipment manufacturer the location and size of the range you need to shield. The most important point is whether there are mobile phone signal towers built by operators within three to four hundred meters, which will affect the selection of the jammer. Find several, compare prices and qualifications, and choose the best.
Mobile phone message blocker
1. Shielded frequency bands: Before purchasing, you need to know which signals you want to block. Can selectively block ordinary mobile phone signals (2G 3G 4G). If you only block 2 and 3G or only 3 and 4G, this can be adjusted before leaving the factory. However, Mohan Communications' mobile phone signal jammer uses full-band shielding. If users need to block a certain signal, they only need to install the corresponding antenna on the machine.
2. Applicable places: Regarding the use of shielding, if it is used in indoor places, it is a shielding device that is generally suitable for examination rooms, conference rooms, offices and other spaces. Gas stations need to be explosion-proof and high-temperature resistant; if it is an outdoor open area, a medium-power signal jammer needs to be used to achieve a suitable distance.
3. Appearance: The shielding cover can be divided into external antenna and internal antenna. Generally speaking, external antennas take up more space than internal antennas because they extend outward. One point; since the antenna extends outward, the effect of an external antenna is more stable.
4. Power size: Shielding devices can generally be divided into small power, medium power and high power. Power ranges from 3W to 100W. When we recommend users to choose Mohan Communications mobile phone signal jammer, it will be based on the area to be shielded.
5. Shielding range: The shielding range is proportional to the power. Generally, test rooms use more low-power signal isolators. It is enough to install one in a classroom, and the shielding range is about 200 square meters. The shielding distance can reach 300-400 meters, depending on the local field strength.  signal jammer
6. Volume: Generally speaking, the smaller ones are handheld and portable, relatively small and easy to carry; low-power desktop computers are generally not very large, similar to small notebook computers; high-power ones are relatively bulky, and the size of the tow box type is very huge.
7. Power supply: The handheld version uses a built-in lithium battery. After the mobile phone signal jammer runs out of power, you can use the power adapter to charge it; the desktop examination room uses 220V voltage supply, and the vehicle power supply is generally 12-36V voltage supply.