Mobile phones are electronic devices that need to communicate with other devices through signal towers, and wireless communication requires electromagnetic waves. According to the characteristics of electromagnetic waves, devices need to receive within the corresponding frequency range, so signal shielding affects electronic products. The frequency of the device makes the two sides have different frequencies, thereby achieving the shielding effect. For Bluetooth and wifi, wireless signal blockers can block these networks, adding Bluetooth and Wi-Fi bands to the scanning range, and blocking connections within the scanning range.

Mobile networks and WIFI have become indispensable in life. It can be said that without mobile networks and WIFI, mobile phones have no ability to connect to the outside world. Because the frequency bands of mobile network and WIFI signals are generally between 450MHz and 6GHz, signal blockers can effectively shield communication signals in this frequency band. When working, interference signals that interfere with the base station channel band will be emitted, and the information cannot be decoded normally, resulting in the inability of the mobile phone to establish a normal connection with the base station. When the mobile phone fails to determine the service area after multiple attempts, the mobile phone will display no signal, search for the network, and is not in the service area.

Unlike the traditional co-frequency suppression method, digital technology integrates signal shielding and monitoring management. This product can monitor illegal use of mobile phones in the coverage area by shielding the downlink signal of mobile phones. It can support the shielding of mobile phones of different standards and will not interfere with the uplink of base stations. The signal jammer has good effect and low cost. In the shielding area of ​​the examination room, it can effectively shield the mobile communication services of various operators, including voice, data, SMS and other services. The network standards include 2G, 3G, 4G and 5G. Due to the use of digital technology, the equipment will not generate noise and will not affect meetings, examinations, etc. during use.