Received and installed the sensor tonight. Installing and integrating the sensor with Smartthings took 5 minutes. I don't know why Sonoff isn't marketed as compatible with Smartthings yet, but I found a forum that says they released the integration in August 2021 and it definitely works. Just click on "Add Device" and select Sonoff as the manufacturer and then select "Multipurpose Sensor". I had to add it twice. The first time it went out after about 1 minute. Seems stable the second time around and has been running for 45 minutes now. (I will update if I encounter any problems) You don't need the Sonoff app (eWeLink smart home). I'll comment on the stability soon, but the device itself is in a great form factor, comes with 3M double-sided tape, and measures no larger than 1.5 inches square. If it stays stable, I'll add a few more sensors. The temperature and humidity readings in Smartthings are accurate and at least match my thermostat readings when placed next to it and I have a high end Infinity. HVAC system with multiple zones and complex controls.
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