Safety
First Alert
Combination Smoke & Carbon Monoxide Alarm
Ten-year sealed battery, two hazards, one device.
Read why Sentinel recommends this below. Buying options are at the end of the page.
Installation difficulty
Easy
Estimated time
15 minutes
Warranty
10 years
Why we recommend it
Covers both smoke and carbon monoxide with no battery swaps. It is most useful for every bedroom hallway and each floor of the home. Compatible with any residential ceiling or wall mount.
When you’ll need it
- • Immediately if any alarm is over 10 years old
- • When moving into a home
- • On every level of a home with combustion appliances
Who benefits most
- • Every household
- • Homes with gas or oil heating
- • Homes with attached garages
Before you buy
Honest guidance — you may not need this at all
- • Check the manufacture date on the back of your existing alarms — replacement is by date, not by looks.
Photograph the manufacture date on the back before mounting. That date, not the install date, drives replacement.
What it does
- • 10-year sealed battery
- • Photoelectric smoke sensing
- • Electrochemical CO sensing
Maintenance tips
- • Press test monthly.
- • Vacuum the housing twice a year.
Frequently asked questions
How many do I need?
One per bedroom, one outside each sleeping area, and at least one per floor including the basement.
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If this product fits your home's needs, you can purchase it through one of our trusted retail partners.
Why this matters
Spending $25–$75 today on preventive maintenance can often help homeowners avoid repairs that cost hundreds or even thousands of dollars later. Sentinel Home recommends products that support long-term home protection — not impulse purchases.
- Retailer:
- Amazon
- Last verified:
- Jul 30, 2026