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Check the listing for details. 4 Way Optocoupler Input 2 Way Relay Output Relay Module 32-bit CPU Relay Board. Condition: New. Listed at 20.74 USD. 4 optocoupler inputs, 2 relay outputs. PLC FX3U relay module. 1x Relay Module. Imported 32-bit CPU, compatible with FX3U series. Due to the light and screen difference, the item's color may be slightly different from the pictures.