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5V 2-Channel Relay Module with Optocoupler Isolation, Supports High and Low L...

5V 4-Channel Relay Module with Optocoupler Isolation, Supports High and Low L...

24V Relay Module with Optocoupler Isolation, 1 Channel High/Low Level Trigger...

2x DC 5V Relay Module 2-Channel Relay Switch Optocoupler Isolation High/Low

DC 5V/9V/12V/24V 1 Channel Optocoupler Relay Module Support High and Low Trigger