Nest Protect 2nd gen Wired (US): what it works with

Google · model Nest Protect 2nd gen (wired) · For the US and Canada

• Matter Unconfirmed
• Apple Home Unconfirmed
• Google Home Yes
• Amazon Alexa Unconfirmed
• SmartThings Unconfirmed
• Home Assistant No

Nest Protect (2nd gen, wired) is a smoke and CO alarm that runs on 120 V with three AA backup batteries. It reports to the Nest and Google Home apps over Wi-Fi and links to other Protects wirelessly. Google no longer sells it but still supports it.

Checked against 6 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]

Hub required

No^[1]

Local control

Unconfirmed

Detects

Smoke, Carbon monoxide (CO)^[1]

Power

Hardwired 120 V, 3 AA backup^[1],[2]

Alarms link wirelessly

Yes^[1]

• Radio: Wi-Fi (2.4 GHz) and Bluetooth LE for setup; it also has an 802.15.4 radio for linking Protects, which isn't in our radio list.
• Hub: Connects over Wi-Fi to a Nest or Google account; no hub.
• Local control: Google doesn't say whether Protect works without the cloud.
• Detects: Split-spectrum smoke sensor and electrochemical CO sensor rated 10 years from manufacture. UL 217 (8th ed.) and UL 2034 (4th ed.).
• Power: The wired model takes 120 V AC with 3 AA lithium backup batteries. A battery model also exists (6 AA); this record is the wired one.
• Alarms link wirelessly: Google lists an 802.15.4 wireless interconnect between Protects; its page doesn't describe how the alarms sound together.

Before you buy

• Google lists Nest Protect as no longer available for sale, but still supported.
• Protect has to be replaced 10 years after its manufacture date because the CO sensor wears out.
• Some features stay in the Nest app only, and setup needs it.

Quick answers

Does the Nest Protect 2nd gen Wired (US) work with Apple Home?

Not confirmed. We couldn't find an official source either way. Google's Protect pages don't mention Apple Home.

Does the Nest Protect 2nd gen Wired (US) work with Google Home?

Yes. The Nest Protect 2nd gen Wired (US) works with Google Home directly. Protect (2nd gen) shows in the Google Home app as a Smoke & CO tile, with alarms, notifications, Sound Check, Pathlight and Nightly Promise. Setup, factory reset, Protect Video Capture, Emergency Shutoff and emergency contacts stay in the Nest app. More smoke and CO alarms for Google Home

Does the Nest Protect 2nd gen Wired (US) work with Amazon Alexa?

Not confirmed. We couldn't find an official source either way. Google's Protect pages don't mention Alexa.

Does the Nest Protect 2nd gen Wired (US) work with SmartThings?

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

Does the Nest Protect 2nd gen Wired (US) work with Home Assistant?

No. Home Assistant's Nest page says smoke and CO alarms aren't supported by the Smart Device Management API its Nest integration uses. Community custom integrations exist but aren't counted.

Sources

1. Nest Protect technical specifications — Google Nest Help manufacturer · accessed Oct 23, 2026
2. Nest Protect 2nd Gen - Installation and Tech Specs — Google Store manufacturer · accessed Oct 23, 2026
3. Nest Protect now available in the Google Home app — Google Nest Help manufacturer · accessed Oct 23, 2026
4. Control your Nest Protect with the Nest app and Google Home App — Google Nest Help manufacturer · accessed Oct 23, 2026
5. Nest Protect expiration dates — Google Nest Help manufacturer · accessed Oct 23, 2026
6. Google Nest - Home Assistant — Home Assistant ecosystem · accessed Oct 23, 2026

Official product page: store.google.com