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4 Channel DC 5V Relay Module with Optocoupler for Arduino UNO4-channel relay output modules, relay output contacts 250A 10A. Input IN1, IN2, IN3, IN4, the signal line LOW effective. VCC, GND power input, can relay a separate power supply relay power input of JD-VCC. 1, support all MCU control. 2, the industrial sector; 3, PLC control; 4, smart home control;