Att Cell Phone Call Blocking

Cell phone jammers are used in many places, such as school exams, prisons, hospitals, etc., but the choice of cell phone signal jammers is also very particular. Do you know how to choose Att Cell Phone Call Blocking ? Many people know the cell phone signal jammer but don’t know how it works. They just think it’s amazing that it can make the cell phone lose the signal in an instant. Then we can take a look at the working principle of cell phone jammer . The mobile phone has a signal because the electromagnetic wave emitted by the base station is received by the electromagnetic wave of the mobile phone, and then there is a signal. The function of the mobile phone signal jammer is that it emits an electromagnetic wave whose wavelength is between long wave and short wave. To interfere with the mobile phone's reception of the electromagnetic wave of the base station, the information received by the mobile phone is garbled, so the mobile phone cannot receive the message normally, and the words such as no service are displayed, which achieves the function of shielding the signal.

Good Att Cell Phone Call Blocking should be green and environmentally friendly, the strength of the electromagnetic field is lower than the national standard, and it is harmless to the human body; and it only shields the mobile phone signals in the test room, has no impact on the mobile phone outside the test room, and will not cause interference to the base station. A good cell phone jammer is of absolute quality. It has a unique design of cooling vents and dual fans to ensure continuous and stable work for a long time; built-in switching power supply to ensure the stability and accuracy of the signal; simple operation, it can run automatically when the power is turned on; the slow-start circuit design can effectively avoid There is a spark phenomenon when starting up; imported high-performance integrated circuits and SMD components are selected.