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SONOFF 4CH Pro R3 Wi-Fi Smart Switch 4-Channel Din Rail Mounting Home Automation,Self-Locking/Interlock Control Home Appliances, RF/APP/Voice/LAN Control, Works with Alexa(1 Pack): Amazon.com: Tools & Home Improvement
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Detailed Connection SONOFF 4CH PRO / Installed the Smart House SONOFF 4CH PRO on a Home Computer - YouTube
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