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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 Ring Alarm Smoke & CO Listener
A sourced, side-by-side comparison. Google Nest Protect (2nd Gen, Battery) is cheaper at $119. Every spec and price links to its source.
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Ring
Ring Alarm Smoke & CO Listener
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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) | Ring Alarm Smoke & CO Listener |
|---|---|---|
| US price | $119 | — |
| Brand | Ring | |
| Released | 2015 | — |
| Sensor type | split_spectrum | audio_listener |
| Detects co | Yes | Yes |
| Power | battery | battery |
| Interconnect | wireless | wireless |
| App alerts | Yes | Yes |
| Voice location alerts | Yes | No |
| Sensor life yr | 10 | — |
| Self test | Yes | No |
Sources — Google Nest Protect (2nd Gen, Battery): support.google.com (verified 2026-08-16). Ring Alarm Smoke & CO Listener: lowes.com (verified 2026-08-16).
What's the difference between the Google Nest Protect (2nd Gen, Battery) and Ring Alarm Smoke & CO Listener?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- Sensor type: Google Nest Protect (2nd Gen, Battery) split_spectrum vs Ring Alarm Smoke & CO Listener audio_listener
- Voice location alerts: Google Nest Protect (2nd Gen, Battery) true vs Ring Alarm Smoke & CO Listener false
- Self test: Google Nest Protect (2nd Gen, Battery) true vs Ring Alarm Smoke & CO Listener false