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

The Google Nest Protect (Wired) 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 longer 10-year warranty.

Power and feature depth separate them. The Google Nest Protect (Wired) runs on house wiring with a battery backup and adds many extra sensors, self-test and a pathlight, while the First Alert SMCO410 Smoke Detector & CO Alarm focuses on core smoke-and-CO sensing with a sealed battery and Z-Wave connectivity.

The First Alert SMCO410 Smoke Detector & CO Alarm has the longer warranty at 10 years, versus 2 years for the Google Nest Protect (Wired), and it runs a 10-year sealed battery. The Nest is hardwired with a battery backup, so battery upkeep is minimal there.

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 (Wired) works with Google Home and Home Assistant, so the right pick depends on your existing ecosystem.

Buy the Google Nest Protect (Wired) if your home has hardwired alarm wiring, you want the better-rated smoke-and-CO alarm with spoken early warnings, self-testing, a pathlight and extra sensors, and you use Google Home or Home Assistant.

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 sealed battery, and you run a Z-Wave, Ring or Home Assistant setup.