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This is a small metal proximity switch with a size of only 34*17.5mm, which can install in a small space. It has high sensitivity and excellent anti-interference ability. It has PNP normally closed output, 4mm detection distance, fast induction, IP67 waterproof level, and can be used indoors and outdoors. It can not only be used for mechanical automation, security equipment, car anti-theft and other operations, but also can be used in the hands of creators to match various control boards for robot runway switching and speed measurement.