First Alert/BRK 9120B / SC-9120B Hardwired 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 9120B | First Alert SM210 / SM210V / SM210L 10-Year Smoke | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | smoke | smoke |
| Sensor | ionization | photoelectric |
| Power | Hardwired 120-volt with 9V battery backup | 10-year battery (lithium metal, not replaceable) |
| Interconnect | wired | Not listed |
| Standards (maker) | Not listed | Conforms to UL 217 10th Edition Standard |
| Replace after | Not listed | 10 years |
First Alert/BRK 9120B / SC-9120B Hardwired
An older hardwired ionization smoke alarm with 9V battery backup.
- Interconnects with up to 12 other First Alert or BRK hardwired smoke detectors and 6 other compatible devices
- 9V battery included
- Ionization sensing 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