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![Amazon.com: [2-Pack] DC 5V Relay Module 2-Channel Relay Switch with Optocoupler Isolation High/Low Level Trigger : Industrial & Scientific](https://m.media-amazon.com/images/I/71NNkhe7-5L._AC_UF894,1000_QL80_.jpg "Amazon.com: [2-Pack] DC 5V Relay Module 2-Channel Relay Switch with Optocoupler Isolation High/Low Level Trigger : Industrial & Scientific")
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