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Amazon.com: DC 12V RS485 4 Channel Relay Module with Optocoupler Protection, STM8S103F3 Relay Board Microcontroller Communication : Industrial & Scientific
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MakerFocus Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B/3 Model B+/Raspberry Pi 3/2 Model B (No Programming Required/Programmable) : Electronics - Amazon.com
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Amazon.com: GeeekPi Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B & Raspberry Pi 3 Model B+ & Raspberry Pi 3/2 Model B (No Programming