First Alert/BRK 9120B / SC-9120B Hardwired vs First Alert SMCO500V Combo
Side-by-side specs from each maker.
Only the differences are shown.
| First Alert 9120B | First Alert SMCO500V Combo | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | smoke | combo |
| Sensor | ionization | Photoelectric (smoke) and electrochemica |
| Power | Hardwired 120-volt with 9V battery backup | AA (2 alkaline, replaceable) |
| Interconnect | wired | wireless |
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 SMCO500V Combo
A battery-operated smoke and CO combo alarm with voice alerts that give the type and location of the danger. It links wirelessly with other First Alert or BRK alarms.
- Voice alerts with location
- Wireless interconnect with up to 12 other First Alert or BRK alarms and 6 other compatible devices
- Replaceable AA batteries