The cell phone jammer in the examination room is mainly used in the college entrance examination, such as the college entrance examination, the graduate student entrance examination, etc.
The cell phone signal shield in the examination room is different from the prison signal shield, which has its own distinct characteristics: first, the working time is generally three hours, and it does not need to run 24 hours a day 365 days like the prison signal shield, so the requirements for heat dissipation are lower; Second, the cost budget of the education department is generally lower, which requires more cost-effective products.
According to the high cost performance of this customer demand, suitable for the school examination room mobile phone signal shield can be divided into external antenna, built-in antenna two.
One of the advantages of the built-in antenna phone signal shield is that it is easy to use and can be directly plugged in, while the external antenna signal shield requires the corresponding antenna to be installed in the correct position according to the label, which is relatively tedious. In addition, the external antenna signal shield dissipates heat through the metal shell on the surface, so the surface temperature is higher after using for a period of time, and even hot.