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Relay Module 5V x 4 Relay w/ Opto-isolation - ProtoSupplies
4-Channel 5V Relay Module - Solarbotics Ltd.
5V 4 Channel Relay Board Module With Optocoupler LED for Arduino PiC ARM.di | eBay
4 Channel Relay Module - Progressive Automations
Amazon.com: ELEGOO 4 Channel DC 5V Relay Module with Optocoupler Compatible with Arduino UNO R3 MEGA 2560 DSP ARM PIC AVR STM32 Raspberry Pi : Electronics
SainSmart 4-Channel 5V Relay Module for Arduino Raspberry Pi – SainSmart.com
Amazon.com: Vogurtime 4 Channel 5V Relay Module with Optocoupler Isolation Support High and Low Level Trigger Relay Red Board : Industrial & Scientific
4 Channel USB Solid State Relay Module With GPIO | Numato Lab