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In today's world, modern security systems utilize communication frequency jammers to prevent unauthorized access and block signals to sensitive information. Here at ShenZhen HaiYi, we specialize in manufacturing jammers which can completely block signals on all specified critical information frequencies. These devices are used all over the world in the military, police services, private security firms, and many other organizations. We are still leading the industry while adhering to the strict ever increasing quality assurance standards so that your operations are safe, efficient, and fully compliant.