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  1. USB Relays with Analog Inputs and GPIO from NCD - ncd.io

  2. USB Relay Controllers - NCD.io

  3. Amazon.com: Usb Relay Controller

  4. USB Relay Modules - Numato Lab | DigiKey - Digi-Key Electronics

  5. 16 Channel USB Relay Module With GPIO And Inputs - Numato Lab

  6. USB Relay Boards: USB Relay Board and modules - Denkovi A E LTD

  7. USB Relay - Numato Lab

  8. 8 Channel USB Relay Module - Numato Lab

  9. USB Relay Controller with High Power Relays - NCD Store

  10. USB Relay