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Amazon.com: HiLetgo 12V 4 Channel Relay Module with OPTO-Isolated Support High and Low Level Trigger : Industrial & Scientific
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![4-Channel Relay Module-10A [Four-Relay-Module] - US $2.50 : HAOYU Electronics : Make Engineers Job Easier](http://www.haoyuelectronics.com/Attachment/Four-Relay-Module/Four-Relay-Module-1.jpg "4-Channel Relay Module-10A [Four-Relay-Module] - US $2.50 : HAOYU Electronics : Make Engineers Job Easier")
4-Channel Relay Module-10A [Four-Relay-Module] - US $2.50 : HAOYU Electronics : Make Engineers Job Easier
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Blue 4 Channel Relay Module 5v 4channel Relay Output 4 Way Relay Module For Arduino - Relays - AliExpress
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Amazon.com: Vogurtime 4 Channel 5V Relay Module with Optocoupler Isolation Support High and Low Level Trigger Relay Red Board : Industrial & Scientific
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