First Alert CO400 Battery Carbon Monoxide Alarm vs First Alert SMCO500V Combo
Side-by-side specs from each maker.
Only the differences are shown.
| First Alert CO400 Battery Carbon Monoxide Alarm | First Alert SMCO500V Combo | |
|---|---|---|
| Type | Smoke or CO alarm | Smoke or CO alarm |
| Alarm | CO | combo |
| Sensor | electrochemical | Photoelectric (smoke) and electrochemica |
| Power | Battery operated | AA (2 alkaline, replaceable) |
| Interconnect | none | wireless |
| Standards (maker) | Listed to UL 2034 Standard | Not listed |
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 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