Sonoff switch complete hack without firmware upgrade, by Ipsum Domus

SONOFF WiFi Smart Curtain Switch with Power Metering TUV Certified, DUALR3 Dual Relay DIY Curtain, Blinds, Roller Shutter,Two Way Smart Switch,Works

Sonoff Dual R3 Lite

SONOFF NSPanel WiFi Smart Scene Wall Switch,2-Switch Panel Smart Home Control,Touchscreen Control for Smart Temperature Function,Lights,Work with

Sonoff 3-Button Touch Wifi Wall Switch T3EU3C-TX

SONOFF 4CH R3 Smart Switch,4 independently Channel WiFi Remote Time Switch, LAN Control, Inching/Self -Locking Mode, Works with Alexa,& Google Home

Sonoff WiFi Wireless Smart Switch

SONOFF - Module connecté ON/OFF MATTER 10A MINIR4M

Using With Sonoff 4CH — ESPHome

Three way switch and Sonoff ZBMINI-L - Devices - Hubitat

Sonoff - ITEAD Wiki