EG : Contact switch : NC - contact closed when magnet and Reed Switch are together.

接触开关: 当磁铁和弹簧开关连在一起的时候,就会切断接触数字计算机控制.

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It works through magnet and magnetic reed switch , so as to detect unauthorized access.

该探测器探测通过磁铁和磁簧开关装置产生报警信号, 达到探测未授权人员的入侵行为.

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