When the mobile phone is operating, it is within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the transmission of data and voice is completed at a certain baud rate and modulation method. Corresponding to this communication principle, cell phone blocker scan from the low-end frequency to the high-end of the forward channel at a specific speed during operation. This scan speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect normal data transmitted from the base station, so the mobile phone connects with the base station. Cannot be established. Mobile phones manifest themselves as search networks, no signals, no service systems, and other phenomena. It is understood that gps blocker on the market can limit cell phone signals at a distance of 500 million meters from the launch station. The shield radius is adjustable and the coverage area reaches over 30 square meters. Mobile jammers can only shield mobile phone signals without affecting other electronic devices. Save power. The power is 12W-480W.