The end of May has arrived, and the college entrance examination in June is approaching. High school students across the country are preparing for the exam. In this information age, the use of mobile phone signal blockers is naturally indispensable in the examination room. With this device, cheating using mobile phones is almost impossible. So, what kind of device is a mobile phone signal blocker?
Purpose of cell phone jammer s
Mobile phone signal blockers are a device specially used to block mobile phone signals. They are mainly used in places where mobile phones are prohibited, such as examination rooms, schools, gas stations, churches, courts, libraries, conference centers, theaters, hospitals, government agencies, financial institutions, prisons, public security departments and military strongholds. In these occasions, mobile phone signal blockers can effectively prevent the entry of signals and ensure the safety and tranquility of the environment.
Common mobile phone signal blocker operating frequency
Common mobile phone signal blockers on the market have operating frequencies including 869-894MHz, 825-960MHz, 1805-1880MHz and 1900-1990MHz. The main operating frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. The blocker can control a range of about 40 meters in diameter, using a DC-DC converter input voltage and an output voltage of 5V.
The annual college entrance examination is a major event that attracts national attention, and it is crucial to ensure the fairness of the examination. The use of mobile phone signal blockers effectively prevents cheating using mobile phones and ensures the fairness of the examination. With the continuous advancement of science and technology, the technology of mobile phone signal blockers is also constantly improving, with a wider range of action and better shielding effect, which can better meet the needs of large-scale examinations such as the college entrance examination.
