The so-called shielding efficiency refers to whether there are blind spots or leaks in the shielding effect. In the vicinity of some prisons, there may be transmitting base stations with strong mobile phone signals. In order to achieve a good shielding effect, it will take a lot of materials and energy accordingly, and the cost will increase accordingly. Therefore, the better the Cell Phone Blocker Walmart shielding effect, the cost will increase accordingly. In practical application, the shielding requirements of the prison area are generally higher, and there are slight leaks and blind spots. The offenders may seize this loophole, so that the mobile phone can be used in the originally stipulated shielding area, and the original intention of shielding the mobile phone cannot be achieved. If the original non-fault service life is 1 year, and the actual use of the fault-free service reaches 3 years, the cost performance will be tripled. If the original fault-free service life is 1 year, and the actual use is less than half a year, there are often failures. Although it is a free warranty, the risk caused is immeasurable, and the personnel resources are also wasted. The corresponding cost-effectiveness is greatly reduced.
If external interference is not considered, Cell Phone Blocker Walmart simply shielding will be relatively easy, as long as the shielding power is increased. However, it is necessary to ensure that the shielded area has no blind spots and leaks. The power intensity in the shielded area is relatively large. If there is a little leakage, it will cause great external interference. This requires cell phone jammer to fully consider when shielding design, and to control it technically, so as to achieve accurate and efficient shielding without external interference. The cost must follow the shielding requirements and budget. You can’t blindly choose cheap products, and you can’t think that expensive products are good. In actual selection, word of mouth is very important. It is also necessary to inspect its past cases on the spot, try the shielding effect, and then make a selection. Combining these four factors, the cost performance of the shielding system can be presented by the following formula: (the larger the result, the higher the cost performance)