First Alert SMCO210 10-Year Smoke & CO Alarm
- Smoke and carbon monoxide in one alarm
- Photoelectric Precision Detection sensing
- 10-Year sealed battery, no replacements
- End-of-life warning
- Slim profile, half the depth of a standard alarm
- 6.56 ounces, battery powered
Updated 3 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A slim sealed-battery alarm that covers smoke and carbon monoxide without wiring or battery changes. It cannot be hardwired or interconnected per the listing, so each unit works alone.
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ASIN: B0CJMMVST2Model: SMCO210
Overview
A photoelectric sensor with Precision Detection reads smoke while a separate CO sensing function watches for carbon monoxide, both in one slim battery unit. The sealed battery runs for the life of the alarm, and an end-of-life signal tells you when to replace it.
No wiring and no battery swaps make it quick to add protection to bedrooms and halls. The listing names no interconnect, so a fire sensed in one room will not sound alarms elsewhere.
Who it's for
Apartments, bedrooms and older homes without alarm wiring get two-in-one coverage. Homes building an interconnected system need a hardwired or wireless-linked model.
Pros and cons
- Smoke and CO in one unit
- No battery changes
- No wiring needed
- Slim, low profile
- Not interconnected per listing
- Whole unit replaced at end of life
- Cannot swap the sealed battery
- Warranty term unclear
Performance notes
Photoelectric sensing reacts to visible smoke particles, and Precision Detection aims to cut nuisance alarms from cooking. The sealed battery removes the low-battery chirp until the end of life, when the whole alarm is replaced. Placement near sleeping areas matters for CO warnings.
Specifications
| Brand | First Alert |
|---|---|
| Model | SMCO210 |
| Dimensions & fit | |
| Item Dimensions D X W X H | 5.67"D x 5.67"W x 1"H |
| Item Weight | 6.56 ounces |
| Power & efficiency | |
| Power Source | Battery Powered |
| Construction & materials | |
| Color | White |
| Enclosure Material | Plastic |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | Warranty |
| Other details | |
| Item Highlight | SMCO210 Slim Profile Design, Sealed Battery |
| Item Type Name | Combination Alarm |
| Operating Humidity | 10-95% RH |
| Product Style | Precision Detection |
| Sensor Type | Photoelectric |
Frequently asked questions
How thin is the First Alert SMCO210?
It measures 5.67 x 5.67 x 1 inches, which the listing says is half the depth of a standard alarm.
Do I ever change the battery in the First Alert SMCO210?
No. The 10-year sealed battery lasts for the life of the alarm, and an end-of-life warning tells you to replace the unit.
Can the First Alert SMCO210 link to other alarms?
The listing does not mention interconnect, so treat it as a standalone alarm.
Does the First Alert SMCO210 detect carbon monoxide?
Yes. It is a 2-in-1 alarm for smoke and carbon monoxide.