Product images: Amazon listings
Written from the listing's specs, not from our own use · How we rate
Smoke and CO in one unit is the headline feature of the First Alert Smoke & CO Alarm. A good match for any house with a generator in the driveway, rated 6.6/10 on its documented specs.
| Brand | First Alert |
|---|---|
| Category | Covers, cords & accessories |
| ASIN | B0CY3BZCX9 |
Full listing title: First Alert Battery Combination Smoke & Carbon Monoxide Alarm
Rated from the listing's specs, no buyer reviews yet
What it's made for: any house with a generator in the driveway.
Two CO alarms close to it on our rating, each with a dated price.
It runs on batteries, per the listing, so it keeps working while the power is out, which is exactly when the generator runs.
Put one on every sleeping floor and one near the door closest to where the generator sits. Push its button once before storm season and listen for the beep.
What the First Alert Smoke & CO Alarm listing names:
Check these figures against your generator's manual before you order.
On Sep 30, 2026, that price put it in the pricier third of the 5 CO alarms we have a recent price for.
The button opens the exact listing (ASIN B0CY3BZCX9), where today's price, stock and seller apply.
Rather plug it in? The Kidde Plug-in CO Detector (6.8/10) plugs in, with a battery backup.
Want to spend less? The First Alert Battery CO Alarm (7.3/10) was listed at $21.95 on Sep 30, 2026.
Our take
The First Alert Smoke & CO Alarm is about smoke and CO in one unit, and it doesn't pretend to be more. No buyer reviews yet, so this First Alert CO alarm has to win you over on paper. The one thing that bugs us: one alarm is not a plan; you want one on every sleeping floor. We'd pick the First Alert if you run a generator anywhere near the house; otherwise, put it next to the Kidde Portable CO Detector (3rd Ed.) first.
Before you order the First Alert Smoke & CO Alarm, check where it will go: it runs on batteries, so it keeps working during the outage; place one near the door closest to the generator.
Find the full model number on your generator's label and compare it with the listing before you order.
One on every sleeping floor and one near the door closest to the generator. Our CO safety and placement guide covers placement.
How the First Alert Smoke & CO Alarm stacks up against the closest alternative, the Kidde Portable CO Detector (3rd Ed.).
| Criterion | First Alert Smoke & CO Alarm | Kidde Portable CO Detector, 3rd Ed. |
|---|---|---|
| Our rating | 6.6/10 | 6.8/10 |
Pick the Kidde Portable CO Detector (3rd Ed.) if you want our higher-rated option (6.8/10).
We rate it 6.6/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Only if your generator manual confirms it. Check the outlet or plug type, the amperage, the list of supported models and any adapter the manual asks for; looking similar is no proof that it fits.
Its listing states battery power, so it works in an outage. These are the seller's figures, not our measurements: whether it fits your exact generator is worth confirming first.
Your exact model: find the full model number on your generator's label and compare it with the listing before you order. Where it goes: one on every sleeping floor and one near the door closest to the generator. Our CO safety and placement guide covers placement.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula, plus our editors' read of how it compares with its rivals.