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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, Compatible with Alexa(2 Pack) - - Amazon.com
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Sonoff 4CH PRO (R3) WiFi + RF smart relay switch with 4 channels, NO/NC and dry contact support - eWelink Store
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