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RPi Relay Board: A Raspberry Pi smart home expansion board that costs just US$18.99 - NotebookCheck.net News
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GeeekPi Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 3/2 B & Raspberry Pi 3 Model B+ & Raspberry Pi 4 Model B(No programming required/Programmable) :
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Waveshare RPi Relay Board, with 3-way Relay Control, with Pi 40PIN GPIO Extension Header, Compatible with Raspberry Pi Series Boards, Used for Pi to Control High Voltage/Current Devices : Amazon.co.uk: Everything Else
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