It is a Reed Switch Sensor Module, In the presence of a magnetic field, a Reed Switch closes the circuit. It's a type of passive electrical switching component that regulates the flow of electricity in a circuit. It consists of a glass envelope containing two ferrous elastic reeds and an inert gas or vacuum. A reed switch is a sensor that closes the circuit when a magnetic field is present. Reed sensors can be employed in a variety of applications that call for contactless On/Off. Reed switches, on the other hand, can be brittle when used directly; as a result, this module can make it simpler to handle and place the sensor in a variety of applications.
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