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Electrobot 4 Channel 5V Relay Module Module with Optocoupler Low Level Trigger Expansion Board - Features: 4 channels, optocoupler, low level trigger, 5V - Pros: Controls 4 devices, safe isolation, reliable - Cons: Low level trigger only

4 channels, optocoupler, low level trigger, 5V
Controls 4 devices, safe isolation, reliable
Low level trigger only