Cell phone signal jammers are mostly used to ensure information security and are born for communication supervision. Supervise the solemnity and quietness of examination rooms, prisons, detention centers, etc., and ensure fairness and impartiality of examinations. Currently, there are equipped Buy A Cell Phone Blocker Online for high school entrance examinations, college entrance examinations, or important examinations. How do we choose a suitable mobile phone signal jammer when we buy it? Before buying, you need to know which signals you want to block. Ordinary mobile phone signals (2G, 3G, 4G) can be selectively blocked. If you only block 2G, 3G or only 3G, 4G, this can be adjusted before leaving the factory of. The cell phone jammer adopts full-band shielding. If users want to shield a certain signal, they only need to install the corresponding antenna on the machine. Regarding the use of shielding, if it is used indoors, the mobile phone signal jammers generally suitable for test rooms, conference rooms, offices and other spaces are one type. Gas stations need to use explosion-proof and high-temperature resistant ones; if it is an outdoor open area, it needs to be used. A medium-power signal jammer can achieve a suitable distance.
Appearance Buy A Cell Phone Blocker Online can be divided into external antennas and built-in antennas. Generally speaking, the external antennas extend outward due to the external antennas, so they occupy a larger space and volume than the built-in antennas; The external antenna is extended, and the effect of the external antenna is more stable. Mobile phone signal jammers can generally be divided into low-power, medium-power, and high-power, and the power is between 3W-100W, and the user depends on the area to be shielded. The shielding range is directly proportional to the power. Generally, the test room uses more low-power signal jammers. It is enough to install one in a classroom, and the shielding range is about 200 square meters. The high-power mobile phone signal jammers can be shielded. Up to 300-400 meters, depending on the local field strength. Generally speaking, the smaller one is hand-held and portable, which is relatively small and easy to carry; the desktop low-power is generally not very large, similar to a small notebook computer; the high-power one is relatively bulky, The size of the tow box is very large. The handheld is a built-in lithium battery, which can be charged with the power adapter after the power is used up; the desktop examination room uses a 220V voltage power supply, and the car is generally 12-36V voltage power supply.
