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3.3V 3V 2 Channel Relay Module with Optocoupler Relay Output 2 Way Relay Module for Arduino: Amazon.com: Industrial & Scientific
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1ch 2ch 4ch 8ch DC 5V 12V Relay Module Board With Optocoupler Relay Output Module For Arduino 1 2 4 8 way PLC Automation c1 - AliExpress
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