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Electronic Spices Single Channel 5v Relay Module with Isolation High Low Level Trigger (1 pcs) - Features: Optocoupler isolation, High/Low trigger, 1 channel, 5V - Pros: Safe isolation, flexible triggering, good value - Cons: Slightly larger than non-isolated versions

Optocoupler isolation, High/Low trigger, 1 channel, 5V
Safe isolation, flexible triggering, good value
Slightly larger than non-isolated versions