First Alert
First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm
$36.45
Reference price as of 2026-08-23 — check Amazon for the current price and stock.
A straightforward, no-wiring battery smoke+CO alarm for renters or apartments where a hardwired or sealed 10-year unit isn't an option.
Full spec sheet
| Key specs | |
| Brand | First Alert |
| Price | $36.45 |
| Capacity | — |
| Continuous output | — |
| Peak / surge output | — |
| Weight | 1 lb |
| Battery chemistry | — |
| Dimensions (L x W x H) | 5 x 5 x 2 |
| Includes solar panel | No |
| Use cases | Home, Apartment |
| Other verified specs | |
| Type | Combination smoke (photoelectric) + CO (electrochemical) |
| Detector power source | 2x AA replaceable batteries |
Pros
- 2-in-1 photoelectric smoke + electrochemical CO detection in one battery-powered unit — no wiring needed
- Precision Detection sensing is tuned to cut down on cooking-smoke nuisance alarms
- Runs on 2 replaceable AA batteries rather than a sealed cell, so batteries can be swapped cheaply anywhere
- End-of-life warning tells you when the whole unit (not just the battery) needs replacing
Cons
- AA batteries need periodic replacement, unlike sealed 10-year units — more ongoing maintenance
- Not interconnectable with other alarms — each unit alarms independently
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