# Google Nest Protect (2nd Gen, Battery) vs First Alert Onelink Safe & Sound: specs and price compared

A sourced, side-by-side comparison of the Google Nest Protect (2nd Gen, Battery) (Google) and First Alert Onelink Safe & Sound (First Alert) among smart smoke detectors.

## Side by side

| Spec | Google Nest Protect (2nd Gen, Battery) | First Alert Onelink Safe & Sound |
| --- | --- | --- |
| US price | $119 | not published |
| Brand | Google | 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 |

## Key differences

- 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

## Sources

- Google Nest Protect (2nd Gen, Battery): https://support.google.com/googlenest/answer/9229922?hl=en (support.google.com, verified 2026-08-16)
- First Alert Onelink Safe & Sound: https://www.firstalertstore.com/store/products/onelink-smoke-and-carbon-monoxide-alarm-with-amazon-alexa-1039102.htm (firstalertstore.com, verified 2026-08-16)

Canonical: https://frontdeskreview.com/gear/smart-smoke-detectors/google-nest-protect-2nd-gen-battery-vs-first-alert-onelink-safe-and-sound/
Cite: Per The Front Desk Review, Google Nest Protect (2nd Gen, Battery) ($119) vs First Alert Onelink Safe & Sound (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-smoke-detectors/google-nest-protect-2nd-gen-battery-vs-first-alert-onelink-safe-and-sound/
License: CC BY 4.0.