Google Nest announced two major changes to its Google Home lineup of smart devices. First, it's going to end sales of its Nest Protect smoke detector, which featured on our list of recommended smoke detectors as one of the smartest fire alarms available.

Google is doing away with its Nest Protect smoke alarms and partnering with First Alert to manufacture a newer, more modern solution.

Nest launched the 2nd gen Protect a year before it became part of Google. Like all smoke detectors, the Nest Protect comes with an expiration date. You're supposed to swap them out every 10 years, so some Nest users are already there.