Has anyone else received the CO400 with one 9 volt battery instead of the two AA batteries listed in description and on picture of packaging display?

Yes, Received the 9-Volt battery version. I live in California. I'm not a lawyer but my research shows that in California Smoke detectors and Combo Smoke/Carbon detectors must come with a 10 year lifespan battery. This law does not seem to apply to devices that only detect Carbon Monoxide like that one for sale here.

Why can't this be purchased in or shipped to California?

I live in California. Yes, I received the 9-Volt battery version. I'm not a lawyer but my research shows that in California Smoke detectors and Combo Smoke/Carbon detectors must come with a 10 year lifespan battery. This law does not seem to apply to devices that only detect Carbon Monoxide like that one for sale here.

the package picture shows 9-volt, but sounds like it is a crapshoot on what they will send you. which is better and lasts longer, 2AA or 1 9V? I hate taking out and putting in 9v batteries. so many to choose from. would prefer plug-in but would be too low.

I bought a package of AA batteries because this item description said it takes 2 AA. It does not. It takes (and comes with) one 9V. This is model CO400.

Red light is on. Is that normal? Tested and it chirps with test. Also checked battery.

YEs, red light is normal. If red light blinks - read manufacturer's guide in link below. https://www.brkelectronics.com/pdfs/2017/10/23/803bf30c.pdf

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Battery Carbon Monoxide Alarm

Product ID: 2536037

Details

Alarm
Audible
Brand
First Alert
Color
White
Global Trade Identification Number
Item Weight
11.2 ounces
Operating Humidity
10-95% RH

📢85 dB loud alarm

🔋9V replaceable battery power

🧪Advanced electrochemical CO sensor

AED 136

Duties & taxes included

In stock

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Description

🚨 Stay ahead of danger with the CO alarm that never sleeps!

PRECISION DETECTION TECH - Electrochemical sensor delivers the most accurate carbon monoxide detection for your peace of mind.
EFFORTLESS SETUP PLACEMENT - No installation hassle—place it anywhere with optional wall mount and sleek, unobtrusive design.
UNINTERRUPTED SAFETY ANYWHERE - Battery-powered design ensures continuous CO monitoring even during power outages—no wiring needed.
SMART END OF LIFE BATTERY SIGNALS - Audible and visual alerts remind you when it’s time to replace batteries or the unit itself, keeping safety seamless.
INSTANT ALERTS THAT CANT BE IGNORED - 85-decibel alarm sounds loud and clear to protect your home from invisible dangers.

The First Alert CO400 Battery Carbon Monoxide Alarm features a highly accurate electrochemical sensor with a 5-year lifespan, powered by a replaceable 9V battery for reliable, uninterrupted monitoring. Its loud 85 dB alarm ensures immediate alerts to dangerous CO levels, while easy no-install setup and smart battery/end-of-life signals provide hassle-free, continuous home safety backed by a 5-year limited warranty and UL certification.

Specifications

ASIN	B000N8OYXI
Alarm	Audible
Best Sellers Rank	#96 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Carbon Monoxide Detectors
Brand	First Alert
Built-In Media	Alarm; Mounting Bracket; User Manual; 9V Battery
Color	White
Customer Reviews	4.6 out of 5 stars 22,108 Reviews
Enclosure Material	Multi
Global Trade Identification Number	00029054000699
Item Dimensions D x W x H	1"D x 5"W x 3"H
Item Highlight	CO400
Item Type Name	First Alert CO400FF Battery Powered Carbon Monoxide Alarm
Item Weight	7.2 ounces
Manufacturer	First Alert
Manufacturer Contact Information	1 (800) 323-9005.
Manufacturer Warranty Description	5 Year Limited Warranty
Mfr Part Number	CO400
Model Number	CO400
Number of Items	1
Operating Humidity	10-95% RH
Power Source	Battery Powered
Product Dimensions	1"D x 5"W x 3"H
Product Style	Battery Powered
Sensor Type	Electrochemical
Style	Battery Powered
UPC	029054000699
Unit Count	1 Count

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