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![4- Pack] DC 12V Relay Module 2-Channel Relay Switch with Optocoupler Isolation High/Low Level Trigger (2 Channel 12V): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/814IOyu0JpL._AC_UF1000,1000_QL80_.jpg "4- Pack] DC 12V Relay Module 2-Channel Relay Switch with Optocoupler Isolation High/Low Level Trigger (2 Channel 12V): Amazon.com: Industrial & Scientific")
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