First Alert SM210 10-Year Slim Smoke Alarm
- 10-year sealed battery, no replacements or low-battery chirps
- Smoke only, photoelectric Precision Detection sensing
- End-of-life warning signals replacement time
- Test/silence button for routine checks
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A slim, sealed-battery smoke alarm built to reduce cooking nuisance alarms and never need a battery swap, suited to bedrooms and hallways. It detects smoke only, so pair it with separate carbon monoxide protection.
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ASIN: B0CJMP11MBModel: SM210Category: Smoke Detectors & Fire Alarms
Overview
A photoelectric sensor tuned with First Alert's Precision Detection technology senses smoke and is designed to reduce nuisance alarms from cooking. The battery is sealed inside for the life of the alarm, and the body is slim and easy to install.
No battery changes and no low-battery chirps for the life of the unit is the reason to choose it. Once the sealed battery is spent, the whole alarm is replaced, and it handles smoke only, with no carbon monoxide sensing.
Who it's for
Landlords and homeowners tired of chirping alarms at night get a set and forget unit. Homes with a hardwired alarm system, or rooms near fuel-burning appliances that need CO coverage, need a different model.
Pros and cons
- Sealed battery means no replacements
- No low-battery chirps
- Designed to reduce cooking nuisance alarms
- Slim, low profile body
- Smoke only, no carbon monoxide sensor
- Interconnect capability not listed
- Whole unit replaced when the battery ends
Performance notes
Detection relies on a photoelectric sensor and First Alert's Precision Detection processing, built to reduce nuisance alarms from cooking while still warning early of a home fire. Placement still matters: an alarm right beside the stove sees more cooking smoke. The sealed battery powers it for its whole service life, after which the end-of-life warning sounds.
Specifications
| Brand | First Alert |
|---|---|
| Model | SM210 |
Frequently asked questions
How thin is the First Alert SM210 smoke alarm?
First Alert says the slim profile is half the depth of a standard alarm, and the listing gives 5.13 by 5.13 inches across with a height of 1 inch.
Does the First Alert SM210 detect carbon monoxide?
No. It is listed as a smoke alarm with a photoelectric sensor, and no carbon monoxide sensor appears in the specs.
What does the date on the First Alert SM210 mean?
The date shown on the product is the manufacture date, which identifies when the alarm was produced.