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Module Interface: 1, VCC: Connect 5V Power Positive2, GND: Connect 5V Power Negative3, In1-In4: Signal Trigger End, Low Level Is Validrelay Output: There Are 12-Wire Interfaces, All d Out, Easy for Users to Useno1-NO4: Relays Feather The Interface, Relays Succeration Before Suspension, Succia and Com Shortcom1-Com4 Relay Common Interfacenc
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