What signals should I pay attention to when purchasing a smartphone blocker?

Before buying, you need to know which signals you want to block. Ordinary mobile phone signals (234G) can be selectively blocked. If you only block 23G or only 34G, this can be adjusted before leaving the factory. In addition, there are 2.4G WIFI, 5.8GWIFI and other frequency bands. Ordinary signals can be quickly blocked.
Knowing the signal strength in the field is very important for signal jammer installation. Because there are many kinds of signals in an environment, and the strength of each signal is different, so knowing the signal strength of the scene can design the device jammer in a targeted manner. According to the results of the survey, the reasonable collocation of different signals has reached the optimal situation. The degree of interference in the non-shielded area and the impact on the surrounding base stations should be fully considered.