Relay Module USB to CH340 Serial Control Relay Module Optocoupler8055

Relay Module 2 Channel USB to CH340 Serial Control Relay Module Optocoupler9409

Relay Module 3 Channel USB to CH340 Serial Control Relay Module Optocoupler9975

Relay Module 3 Channel USB to CH340 Serial Control Relay Module Optocoupler2525

16 Channel Relay Board USB Serial Port Control Switch SPDT Relay Module

Relay Module 3 Channel USB to CH340 Serial Control Relay Module Optocoupler1870

Relay Module USB to CH340 Serial Control Relay Module Optocoupler9657

Relay Module 3 Channel USB to CH340 Serial Control Relay Module Optocoupler6256