First Alert SMCO410 Smoke Detector & CO Alarm vs Google Nest Protect (Battery)

The Google Nest Protect (Battery) is better overall, winning on owner rating, a deeper sensor suite, self-testing, a pathlight and wider integration. The First Alert SMCO410 Smoke Detector & CO Alarm counters as the more affordable unit with a 10-year warranty and battery life.

Feature depth versus longevity is the biggest difference. The Google Nest Protect (Battery) adds occupancy, temperature, humidity, light and motion sensors, self-test and a pathlight, while the First Alert SMCO410 Smoke Detector & CO Alarm focuses on core smoke-and-CO sensing with a long warranty and Z-Wave connectivity.

The First Alert SMCO410 Smoke Detector & CO Alarm wins here with a 10-year sealed battery and a 10-year warranty. The Google Nest Protect (Battery) runs on 6 AA batteries rated for about 2 years with a 2-year warranty, trading longevity for far more sensing and smart features.

The First Alert SMCO410 Smoke Detector & CO Alarm uses Z-Wave and works with the Ring Base Station and Home Assistant. The Google Nest Protect (Battery) works with Google Home and Home Assistant, so your existing ecosystem should guide the choice.

Buy the Google Nest Protect (Battery) if you want the better-rated, feature-rich smoke-and-CO alarm with spoken early warnings, self-testing, a pathlight and extra sensors, and you live in a Google or Nest household without hardwired alarm wiring.

Buy the First Alert SMCO410 Smoke Detector & CO Alarm if you want an affordable combined smoke-and-CO alarm with a long 10-year warranty and battery life, and you run a Z-Wave, Ring or Home Assistant setup.