First Alert SMCO210 / SMCO210V Combo vs First Alert SMI100-AC Hardwired Smoke
Side-by-side specs from each maker.
Only the differences are shown.
| First Alert SMCO210 / SMCO210V Combo | First Alert SMI100-AC Hardwired Smoke | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | combo | smoke |
| Sensor | Photoelectric (smoke) and electrochemica | ionization |
| Power | 10-year battery (lithium metal, not replaceable) | Hardwired with 9V alkaline battery backup (replaceable) |
| Interconnect | Not listed | wired |
| Standards (maker) | Conforms to UL 217 10th Edition Standard; Conforms to STD UL2034 | Not listed |
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
First Alert SMI100-AC Hardwired Smoke
A hardwired ionization smoke alarm with a 9V battery backup that interconnects with other First Alert or BRK hardwired alarms. The maker lists it as the replacement for the 9120B.
- Hardwired interconnect with up to 12 other First Alert or BRK detectors and 6 other compatible devices
- 9V battery backup
- 10 year limited warranty
- Ionization sensing only
- Voice alerts not offered on this model