5v 1 2 4 8 Channel Relay Module With Optocoupler. Relay Output 1 2 4 8 Way Relay Module In Stock For Arduino - Integrated Circuits - AliExpress
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Handson Technology
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SainSmart 4-Channel 5V Relay Module for Arduino Raspberry Pi – SainSmart.com
Grove - SPDT Relay(30A) Datasheet by Seeed Technology Co., Ltd | Digi-Key Electronics
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