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Specification: Product name: Hall Magnetic Sensor Module Type: KY-003 Working voltage: DC 5V Package includes: 5 x Hall Magnetic Sensor Modules Non-Contact Switch Hall switch IC uses Hall effect principle, Using semiconductor integrated technology to make magnetic identification of circuits, It consists of a voltage regulator, a Hall voltage generator, a differential amplifier, a Schmidt trigger, a temperature compensation and an open collector output stage circuit composed of a magnetic sensitive sensor circuit Its input magnetic induction intensity, output for digital voltage signal