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4-Channel USB Relay Board with 6-Channel A/D Interface
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TSRU430- 4 Channel 30A USB Relay Board
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USB 4 Channel (10A) Relay Output Module,Board for Home Automation: Amazon.com: Industrial & Scientific
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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
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