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It's a 4 Channel 5V 10A Relay Module with optocoupler. This relay module can relay a separate power supply relay power input of JD VCC. It has Input IN1, IN2, IN3, IN4 signal line active low, 5V 4-Channel relay board controlled directly by micro-controller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) need 50-60mA driver current
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