Relay Module, 2 Channel Relay Module with Optocoupler Isolation High and Low Level Trigger for Arduino 5V/12V/24V(5V) : Amazon.co.uk: Business, Industry & Science
5V/12V/24V 8 Channel Optocoupler Relay Module Board with High/Low and Trigger Power Indicator Light(24V): Amazon.com: Industrial & Scientific
Amazon.com: 5V Relay Module with Optocoupler Isolation Support High and Low Level Trigger Relay Red Board (8 Channel 5V Relay) : Industrial & Scientific
Amazon.com: Icstation 24V to 5V 8 Channel PLC-PNP Signal Converter, Optocoupler Isolation Board, Voltage Level Converter Module : Electronics
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NOYITO 1 Channel Relay Module with Isolated Optocoupler 5V 12V 24V High Low Level Trigger Module Triggered (Pack of 3) (5V, Red): Amazon.com: Industrial & Scientific
ZYAMY 2 Channel 12V Red Board Relay Module with Optocoupler Isolation Supports High and Low Level Trigger for SCM Household Appliance Control: Amazon.com: Industrial & Scientific
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NOYITO 4-Channel Relay Module 5V 12V 24V High Low Level Trigger with Optocoupler Isolation Relay Load AC 250V 10A DC 30V 10A (DC 5V, Red): Amazon.com: Industrial & Scientific