Smoke/CO sensors with good HA integration

Did you try reducing the sensitivity? There are 3 levels. And in regards to battery, what is the wakeup intervall?

I have no issues with them, i actualy think they are great

Where did you buy them? I can’t find them anywhere in the US

i dont think they are available there. produced and sold in poland

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X-Sense XC04-WX uses ESP32, so there might be a way to flash it with ESPHome.

Now there is a custom integration for x-sense devices like the XC04-WX: GitHub - Jarnsen/ha-xsense-component_test: HACS Integration for X-Sense devices

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The underlying X-Sense app has some issues, as described here: Entities available when device offline (Smoke/CO alarm SC07-WX) · Issue #66 · Jarnsen/ha-xsense-component_test · GitHub