Relay Board 4 Channel
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4 Channel Relay Board - Electronics-Lab

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Mgaxyff 1pc 4 Channel Relay Module Board STM8S103F3 Microcontroller

4-Channel Relay Driver Module – SuperHouse Automation

4 Channel Relay Board - jpralves.net

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4 Channel relay board - Nimesh Electronics

12V 16 Channel Relay Module with OptoCoupler LM2576 Power Supply