Google Nest Protect (Wired) vs X-Sense Wi-Fi Carbon Monoxide Alarm

The Google Nest Protect (Wired) is the more complete buy because it detects both smoke and carbon monoxide, adds extra sensors, self-tests and connects to Google Home and Home Assistant. The X-Sense Wi-Fi Carbon Monoxide Alarm is CO-only, but it is cheaper, has a 5-year warranty and shows live CO levels on its LCD.

The Google Nest Protect (Wired) is a combined smoke-and-CO alarm, while the X-Sense Wi-Fi Carbon Monoxide Alarm detects carbon monoxide only and does not sense smoke at all. That makes the Nest a full replacement for both alarm types, and the X-Sense a supplement to existing smoke detectors.

No. The X-Sense Wi-Fi Carbon Monoxide Alarm is a dedicated CO detector with no smoke sensor and no fire alerts, so it must be paired with a smoke alarm for full coverage. The Google Nest Protect (Wired) handles both hazards in one unit.

The X-Sense Wi-Fi Carbon Monoxide Alarm does on both counts: it has an LCD that shows live CO readings from 30 to 999 ppm and carries a 5-year warranty, versus the screenless Google Nest Protect (Wired) with its 2-year warranty.

Buy the Google Nest Protect (Wired) if you have alarm wiring and want one hardwired unit covering both smoke and carbon monoxide, with spoken early warnings, phone alerts, self-testing and a pathlight, in a Google or Nest home.

Buy the X-Sense Wi-Fi Carbon Monoxide Alarm if you already have smoke detectors and just need an affordable, standalone CO alarm with phone alerts and a live LCD reading, without smoke detection or smart home integration.