This smart smoke alarm could be a worthy Nest Protect replacement
Briefly

Gentex's new line of smart alarms, named Place, is positioned as a successor to the Google Nest Protect, which is no longer available. These alarms include comprehensive features such as smoke and CO detection, indoor air quality monitoring, and a built-in security camera. Various models are available for different purposes, starting at $139. However, they disappoint with the absence of smart home integration capabilities, which limits their functionality in fully automated homes.
Place is introducing a new line of smart alarms that add indoor air quality monitoring and a security camera, despite lacking smart home integrations.
The new smart alarms from Place provide features like phone notifications, temperature and humidity sensing, but fall short on integrating with existing smart home platforms.
Read at The Verge
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