First Alert CO400 Battery Carbon Monoxide Alarm vs First Alert SMCO210 / SMCO210V Combo
Side-by-side specs from each maker.
Only the differences are shown.
| First Alert CO400 Battery Carbon Monoxide Alarm | First Alert SMCO210 / SMCO210V Combo | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | CO | combo |
| Sensor | electrochemical | Photoelectric (smoke) and electrochemica |
| Power | Battery operated | 10-year battery (lithium metal, not replaceable) |
| Interconnect | none | Not listed |
| Standards (maker) | Listed to UL 2034 Standard | Conforms to UL 217 10th Edition Standard; Conforms to STD UL2034 |
First Alert CO400 Battery Carbon Monoxide Alarm
A battery-operated carbon monoxide alarm with an electrochemical sensor, a single test and silence button and an 85 decibel horn.
- Portable
- Single test and silence button
- 85 decibel alarm
- Battery powered only
First Alert SMCO210 / SMCO210V Combo
A battery-powered smoke and carbon monoxide combo alarm with a sealed 10-year lithium battery.
- Sealed 10-year battery, no battery swaps
- UL 217 10th edition and UL 2034
- Slim profile