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Google Nest Protect (2nd Gen, Battery)
$119
Released 2015
Best Smart Smoke Detectors · head-to-head
Google Nest Protect (2nd Gen, Battery) vs First Alert Onelink Safe & Sound
A sourced, side-by-side comparison. Google Nest Protect (2nd Gen, Battery) is cheaper at $119. Every spec and price links to its source.
First Alert
First Alert Onelink Safe & Sound
—
Released 2017
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Google Nest Protect (2nd Gen, Battery) | First Alert Onelink Safe & Sound |
|---|---|---|
| US price | $119 | — |
| Brand | First Alert | |
| Released | 2015 | 2017 |
| Sensor type | split_spectrum | photoelectric |
| Detects co | Yes | Yes |
| Power | battery | hardwired |
| Interconnect | wireless | wireless |
| App alerts | Yes | Yes |
| Voice location alerts | Yes | Yes |
| Sensor life yr | 10 | 10 |
| Self test | Yes | Yes |
Sources — Google Nest Protect (2nd Gen, Battery): support.google.com (verified 2026-08-16). First Alert Onelink Safe & Sound: firstalertstore.com (verified 2026-08-16).
What's the difference between the Google Nest Protect (2nd Gen, Battery) and First Alert Onelink Safe & Sound?
Where the two actually differ on the specs we track (2 of 8). Matching specs are omitted.
- Sensor type: Google Nest Protect (2nd Gen, Battery) split_spectrum vs First Alert Onelink Safe & Sound photoelectric
- Power: Google Nest Protect (2nd Gen, Battery) battery vs First Alert Onelink Safe & Sound hardwired