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2 channel 5V Relay Module Board Optocoupler Relay for Arduino, Raspberry Pi, pcDuino - Arcade-Expert, Your Retro Arcade Gaming Store
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12V Relay Module with Isolated Optocoupler High or Low Level Trigger Relay Board 2 Channel 5V Relay Module Relay Switch for Raspberry Pi Arduino Relay DIY 5PCS (12V-2Channel): Amazon.com: Industrial & Scientific
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