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SainSmart 4-Channel Relay Module
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![Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/710lO84lESL._AC_UF1000,1000_QL80_.jpg "Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific")
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Amazon.com: YXQ DC 24V 1 Channel Relay Module High/Low Level Trigger PCB Board for DIY Project : Electronics
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Amazon.com: SainSmart 8-Channel Relay Module : Everything Else
