First Alert
First Alert Onelink Safe & Sound
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Released 2017
Best Smart Smoke Detectors · head-to-head
First Alert Onelink Safe & Sound vs Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF)
A sourced, side-by-side comparison. First Alert Onelink Safe & Sound is cheaper at —. Every spec and price links to its source.
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Kidde
Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF)
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  First Alert Onelink Safe & Sound | Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF) |
|---|---|---|
| US price | — | — |
| Brand | First Alert | Kidde |
| Released | 2017 | — |
| Sensor type | photoelectric | photoelectric |
| Detects CO | Yes | Yes |
| Power | hardwired | hardwired |
| Interconnect | wireless | wired |
| App alerts | Yes | Yes |
| Voice location alerts | Yes | — |
| Sensor life (yr) | 10 | 10 |
| Self test | Yes | Yes |
Sources — First Alert Onelink Safe & Sound: firstalertstore.com (verified 2026-08-16). Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF): kidde.com (verified 2026-08-16).
What's the difference between the First Alert Onelink Safe & Sound and Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF)?
Where the two actually differ on the specs we track (1 of 8). Matching specs are omitted.
- Interconnect: First Alert Onelink Safe & Sound wireless vs Kidde Smart Smoke + CO Alarm with Indoor Air Quality Monitor (P4010ACSCOAQ-WF) wired