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
OUTPUT 4 relay board NO NC COM 24V 9A USB connection PC software 5 V / DC
Buy Conrad Components 197730 Relay card Component 12 V DC | Conrad Electronic
USB 4 Channel Relay Board
USB Relay
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
TSRU430- 4 Channel 30A USB Relay Board
USB Relay for Windows, Mac, and Linux - Industrial Grade
MDC-P6N 6 CH Turn On Delay & DC Speaker Protection with Thermal Switch Input - Motronix