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A cell phone jammer is a device that emits signals in the same frequency that cell phones use
Use cell phone signal jammer in the examination room is a way to prevent student cheating, but not the only way, which requires legal constraints.
GSM is the Global System for Mobile Communications acronym, meaning global mobile communication system, is one of the world is major cellular systems. GSM Jammer is shielded equipment such signals.上海专业外贸网站建设，最专业的外贸建站服务
Cell phone blocker to block the 3G 4G mobile phone signal similar, in the process of buying, we should note that we need to distinguish the type of signal blocking.
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