First Alert CO400 Battery Carbon Monoxide Alarm vs First Alert SM210 / SM210V / SM210L 10-Year Smoke
Side-by-side specs from each maker.
First Alert SM210 / SM210V / SM210L 10-Year SmokeList price not published
Only the differences are shown.
| First Alert CO400 Battery Carbon Monoxide Alarm | First Alert SM210 / SM210V / SM210L 10-Year Smoke | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | CO | smoke |
| Sensor | electrochemical | photoelectric |
| 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 |
| Replace after | Not listed | 10 years |
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 SM210 / SM210V / SM210L 10-Year Smoke
A photoelectric smoke alarm with a sealed 10-year lithium battery and a slim profile. Voice and path-light versions are separate models from the same maker.
- Sealed 10-year battery
- UL 217 10th edition
- The maker lists a lifespan of about 10 years
- Smoke only, no CO sensing