The popular products will be replaced by new models from First Alert and Yale.

"The Nest Protect has been one of our most beloved devices," said Anish Kattukaran, Chief Product Officer at Google Home & Nest, "And we are excited to be partnering with established industry leaders like First Alert so users can manage more of their safety devices together, for a safer and more protected home."

Nest has just announced that it’s not building the Nest Protect Smart Smoke and CO Alarm alongside a smart lock. Here’s all you need to know.