MANUFACTURER SPECIFICATION GUIDE
First Alert CO400 Battery CO Alarm
First Alert CO400 is a battery-powered residential carbon monoxide alarm. Its manufacturer documentation references UL 2034; that reference is not evidence of RV suitability.
Source review: Oct 2026 · ASIN: B000N8OYXI · Not a test date
Manufacturer-published specifications
These are published ratings, not results measured by us. Missing specifications are omitted rather than estimated.
| Function | Carbon monoxide alarm |
|---|---|
| Power source | 9 V battery |
| Test category / standard | UL 2034 |
Ratings can differ by revision and regional variant. Match the current product label and manual to the listing before purchase.
Conditions & limits to check
- Do not infer RV, tent or vehicle approval from this residential listing. Confirm the intended environment, placement and temperature limits in the current manual.
- We have not tested detection, alarm response or battery life. An alarm is not a substitute for following equipment ventilation and combustion warnings.
Before selecting this item, check the manufacturer's current instructions for the exact model. We have not verified its suitability for your device, campsite or electrical installation.
Read the category buying checklist →Manufacturer sources
Published information used for this guide. Manufacturer documents hosted by another service are identified below. A source does not replace the current operating manual.
- First Alert manufacturer informationsupport.firstalert.com
- First Alert manufacturer manual (Amazon-hosted PDF)m.media-amazon.com
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Check the current purchase listing
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