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USB 4 Channel (10A) Relay Output Module,Board for Home Automation: Amazon.com: Industrial & Scientific
Conrad Components 197720 Relay card Component 12 V DC, 24 V DC | Conrad.com
USB 4 Channel (10A) Relay Output Module,Board for Home Automation: Amazon.com: Industrial & Scientific
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TRU COMPONENTS Relay card Component 5 V DC | Conrad.com
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TRU COMPONENTS Relay card Component 5 V DC | Conrad.com
NOYITO 4-Channel 12V Computer USB Control Switch Relay Module Drive-Free Relay Module Plug and Play Suitable for PC Smart Controller: Amazon.com: Industrial & Scientific