How disable 4G signals?
Although 4G signals are needed, they still need to be blocked in some special cases. For example, during an exam, or during a confidential meeting. But America still has no effective solution. Many experts have been looking for solutions for a long time
Recently, Perfectjammer has launched a cell phone signal jammer that is dedicated to confidentiality. It is reported that this device is very effective. Both the United States and Japan now buy the product on a large scale. China has the highest usage rate of signal jamming equipment