First Alert Battery Carbon Monoxide Alarm | CO400

$21.99

Confirm offer eligibility on Amazon

Size: Pack of 1

Price checked Oct 19, 2026, 7:21 AM PDT

Sources and offer details

Offer eligibility and condition come from available Amazon API observations; missing facts remain unverified.

Observed condition: New.

Coupon and subscription requirements have not been independently verified.

Paid link. As an Amazon Associate we earn from qualifying purchases.

Prices and availability change often and may differ by the time you reach Amazon.com. The price on Amazon.com at the time of purchase is the one that applies.

Product details

ASIN: B000N8OYXI
GTIN / UPC: 029054000699
Brand: First Alert
Category: Tools & home improvement
Availability: In stock at last check
Last checked: today

Specifications

Size: Pack of 1
Color: White
Model: CO400
Part number: CO400
Manufacturer: First Alert
Dimensions: 5.0 × 1.0 × 3.0 in
Weight: 11.2 oz

About this item

Keep your family safe with this easy to use, battery operated carbon monoxide alarm; Battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room.The alarm sequence should last 5-6 seconds. If it does not alarm, make sure fresh batteries are correctly installed, and test it again. If the unit still does not alarm, replace it immediately
A loud 85 decibel alarm sounds when CO levels reach dangerous , Battery Replaceable - Yes
To ensure complete protection make sure to place one on each level of your home and in each bedroom
5-year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
All first alert CO alarms are rigorously tested to meet UL standards
First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)

Other sizes and options

First Alert