First Alert Onelink Safe & Sound (US): what it works with

First Alert · model Onelink Safe & Sound (1039102) · For the US and Canada

• Matter Unconfirmed
• Apple Home Yes
• Google Home Unconfirmed
• Amazon Alexa Unconfirmed
• SmartThings Unconfirmed
• Home Assistant Unconfirmed

The Onelink Safe & Sound is a hardwired smoke and CO alarm with an Alexa speaker built in. It runs on 120 V house wiring with a 10-year sealed backup battery and connects over Wi-Fi and Bluetooth. Apple Home is its only confirmed smart home link; Alexa runs on the unit as a speaker, and Google Home, SmartThings and Home Assistant are not confirmed. First Alert has discontinued it.

Checked against 3 sources on Oct 23, 2026

Ecosystem compatibility

“Via Matter” means you add it with that platform's Matter controller instead of a brand skill or app. “Unconfirmed” means we couldn't find an official source either way. How we verify.

Specs that matter for setup

Radio

Wi-Fi, Bluetooth^[1],[3]

Hub required

No^[1]

Local control

Unconfirmed

Detects

Smoke, Carbon monoxide (CO)^[1]

Power

Hardwired 120 V, 10-year sealed battery^[1]

Alarms link wirelessly

Yes^[1]

• Radio: First Alert's store page lists Wi-Fi and Bluetooth; the 2018 Gearbrain review says 2.4 GHz Wi-Fi (802.11b/g/n) plus Bluetooth for streaming from a phone.
• Hub: The unit connects to Wi-Fi and the Onelink app by itself.
• Local control: First Alert doesn't say whether the alarm works without the cloud.
• Detects: Photoelectric smoke sensor and electrochemical CO sensor. Listed to UL 217 and UL 2034.
• Power: Needs AC power; the 10-year sealed lithium battery is the backup.
• Alarms link wirelessly: The specs list Wi-Fi and Bluetooth wireless interconnect with other compatible alarms. The page also describes wired interconnect (orange wire, up to 18 devices, no more than 12 smoke alarms).

Before you buy

• First Alert's store page says the item is discontinued and points to the SC5 hardwired smart alarm instead.
• Alexa is built into the unit as a speaker; First Alert doesn't say the alarm shows up in the Alexa app.
• Needs 120 V wiring; the sealed battery is only a backup.

Quick answers

Does the First Alert Onelink Safe & Sound (US) work with Apple Home?

Yes. The First Alert Onelink Safe & Sound (US) works with Apple Home directly. First Alert's store page lists Apple HomeKit, Apple Home and AirPlay 2 under compatibility. Reviews are mixed on how much shows up in Home; one says Siri can report only smoke detection. More smoke and CO alarms for Apple Home

Does the First Alert Onelink Safe & Sound (US) work with Google Home?

Not confirmed. We couldn't find an official source either way. Launch coverage in 2018 said a Google Assistant version would follow; First Alert's page doesn't mention Google Home.

Does the First Alert Onelink Safe & Sound (US) work with Amazon Alexa?

Not confirmed. We couldn't find an official source either way. Alexa is built into the unit, which works as an Alexa speaker for voice and music. First Alert doesn't say the alarm itself reports its state to the Alexa app, so that isn't counted as compatibility.

Does the First Alert Onelink Safe & Sound (US) work with SmartThings?

Not confirmed. We couldn't find an official source either way. No SmartThings support found.

Does the First Alert Onelink Safe & Sound (US) work with Home Assistant?

Not confirmed. We couldn't find an official source either way. No Home Assistant integration found.

Sources

1. Onelink Safe & Sound Hardwired Smoke + Carbon Monoxide Alarm with Amazon Alexa — First Alert manufacturer · accessed Oct 23, 2026
2. First Alert Launches Onelink Safe & Sound Alexa-Enabled Smoke and CO Alarm and Home Speaker — audioXpress review · accessed Oct 23, 2026
3. First Alert Onelink Safe and Sound Review with Apple Homekit — Gearbrain review · accessed Oct 23, 2026

Official product page: www.firstalertstore.com