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Micro USB 5V 4 Channel USB Relay Module Smart Switch Control Serial Port | eBay
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32 Channel USB Relay Module With GPIO And Analog Inputs | Numato Lab
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Amazon.com: SainSmart USB Eight Channel Relay Board for Automation - 12 V : Industrial & Scientific
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5v 1 Channel Usb Relay Module Programmable Computer Control For Smart Home 5 V 1way Relays Board - Relays - AliExpress
USB 16 Channel Relay Module - RS232 Controlled
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