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SainSmart 4-Channel Relay Module + Free Shipping
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Amazon.com: JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM : Electronics
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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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