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

4 Channel Relay Module 1 SPDT DIN Rail Mount 24V DCAC Interface Relay Module

2 Channel Relay Module 1 SPDT DIN Rail Mount 24V DCAC Interface Relay Module

Unopened SainSmart 8-Channel USB Relay Board Module 12V Automation FTDI Sealed

16 Channel 9-36V USB Controlled SPDT Relay Module Opto-isolated Board SRD-5VDC

4 Channel Relay Module 1 SPDT DIN Rail Mount 24V DCAC Interface Relay Module

2 Channel Relay Module 1 SPDT DIN Rail Mount 24V DCAC Interface Relay Module

Microcontroller Compatible 16-Channel Relay Module with LED Indicators