first alert logo

Basic Battery Operated Carbon Monoxide Alarm

  • Basic Battery Operated Carbon Monoxide Alarm
First Alert Carbon Monoxide Alarm CO400

Regular Price: $34.99
Price: $17.99
You Save: $17.00

Send To Friend Print This Page

Basic Battery Operated Carbon Monoxide Alarm

Battery operated carbon monoxide alarm with mute button to silence any nuisance alarms. Single button also tests alarm functions. Carbon monoxide alarm utilizes electrochemical sensor for increased accuracy. 5-year limited warranty. Carbon Monoxide alarm meets UL standards.

This carbon monoxide alarm is for you if:

You want basic protection from the threat of carbon monoxide.

Where To Place Carbon Monoxide Alarms: One on every level of the home and one in each sleeping area.

First Alert Carbon Monoxide Alarm CO400

Basic Battery Operated Carbon Monoxide Alarm Features:

  • Battery operated, 9V battery included.
  • Mute button, mutes unnecessary alarms. also tests alarm function with same button.
  • Low battery signal mute, quiets low battery signal for up to 8 hours.
  • Electrochemical sensor, most accurate technology available for detecting carbon monoxide* *compared to other common sensing technologies.
  • End of life timer, alarm chirps when it is time to replace it.
  • 9V battery included.
  • Loud 85db alarm.
  • 5-year limited warranty, carbon monoxide alarms should be replaced every 5 years for maximum protection.
  • Meets UL2034 standard.
  • Emits T3 Pattern.
Click Here to Write a Review for this Product. Review

Average Customer Rating Based on 92 reviews: Rating: 4.85869565217391/5Rating: 4.85869565217391/5Rating: 4.85869565217391/5Rating: 4.85869565217391/5Rating: 4.85869565217391/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Perfect! - 03/28/2017
Reviewer: Michael Rettig
Pleasantly surprised at how easy installation was.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Easy to install, great reminder beep - 03/13/2017
Reviewer: James Kirven
I had one of these CO sensors for about 5 years. The beep was a reminder to replace it after 5 years. I'm very secure having the First Alert sensor. Battery operated won't fail with a power outage and the battery lasted a long, long time. There is also an alert to change the battery.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Minor replacement installation glitch - 03/09/2017
Reviewer: Ron Chestnut
The mounting screw pattern for exactly the same model changed in the last 5 years. No big deal redrilling holes, but it would have been nice to just put the new one in with no work.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Battery Co alarm - 03/04/2017
Reviewer: jean feick
easy to install

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Very Pleased - 02/21/2017
Reviewer: Geraldine Stephens
The First Alert brand is a trusted brand I have been buying for many years. I did try my local hardware stores and they did not have the model alarm I wanted. So I ordered directly from First Alert online and received the correct alarm in few days. Very pleased. Jeri Stephens Mission Viejo, CA

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 01/31/2017
Reviewer: Robert Emmick
Very happy with the Basic Battery CO alarm. Replaced one that was older.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 I got what I wanted - 01/27/2017
Reviewer: Jarred OLoughlin
It was back ordered but it was what I wanted and ordered. Easy to install

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Fine replacement for older model that was no longer working - 12/28/2016
Reviewer: Robert Lustig
This model is the newer version of the one I purchased a number of years ago. It works just fine. The only criticism I have is that the holes are spaced farther apart for mounting, so I needed to drill new holes - no big deal since the old holes are hidden by the alarm.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 First Alert - first choice ! - 09/20/2016
Reviewer: Mike Bubrick
Our firm services carbon monoxide detectors in more than 600 living units managed by a local real estate company. We have 7 years experience with all brands of CO detectors. Our first choice of CO detector is the First Alert CO400. The dependability of the unit, the power behind it 9 volts vs 2 or 3 AA 1.5 volt batteries and the secure installation method all combine to make this model a winner. So far in 2016, we have installed 340 CO-400s and the year isn't finished!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 It really works! - 12/26/2015
Reviewer: DMendez
We have this model in our 2nd floor bedroom which is right above the kitchen. One evening, we used the oven and were having some issues with it heating up. I thought we got it figured out. A little while later, the CO2 alarm went off and wouldn't shut off until we opened all the windows and got fresh air in the house. Needless to say I'm very pleased with this product and I got a new stove too!

Read All Reviews
Q: How often do you need to change the batteries?
A: Actual battery service life depends on the particular design of your smoke or carbon monoxide alarm and the environment in which it is installed. All kinds of alarm batteries specified in the user's manual are acceptable replacement batteries. Regardless of the manufacturer's suggested battery life, you MUST replace the batteries immediately once the unit starts "chirping" (the "low battery warning"). It is recommended that you change the batteries in your alarms when you change your clocks for daylight saving time. Also consider replacing your current alarms with 10-Year Life alarms that never require a costly battery replacement for the ten year life of the alarm. This 10-Year series is available in smoke, carbon monoxide and combination alarms.

Q: How do I get my carbon monoxide alarm to stop chirping?
A: If your carbon monoxide alarm keeps chirping, the battery may be low or weak. On First Alert carbon monoxide detectors, check to see if the battery light is yellow or green. If the alarm is chirping and the light is yellow, it means the battery is low. The way to get a carbon monoxide alarm to stop chirping is to replace the battery.

Q: Where should I install carbon monoxide alarms? What is proper carbon monoxide alarm placement?
A: It is very important to install carbon monoxide alarms near or in each separate sleeping area. Many states now require that a carbon monoxide alarm is placed in each bedroom. For added protection, placement of an additional carbon monoxide alarm at least 15-20 feet away from the furnace or fuel burning heat sources is recommended. Also, install carbon monoxide alarms at least 10 feet from sources of humidity like bathrooms and showers. In two story houses, install one carbon monoxide alarm on each level of the home. If you have a basement, carbon monoxide alarm placement is recommended at the top of the basement stairs.

Q: Is there anywhere I shouldn't install carbon monoxide alarms?
A: Do not install carbon monoxide alarms in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas. Do not install alarms in direct sunlight, or areas subjected to temperature extremes. These include unconditioned crawl spaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches. Carbon monoxide alarms should not be installed in outlets covered by curtains or other obstructions. Do not install in turbulent air-near ceiling fans, heat vents, air conditioners, fresh air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.

Q: How many carbon monoxide alarms should I have in my home?
A: So how many carbon monoxide alarms should you have in your home? The National Fire Protection Association (NFPA) recommends that you should have a carbon monoxide alarm centrally located outside of each separate sleeping area in the immediate vicinity of the bedroom. For added protection, you should have additional carbon monoxide alarms in each separate bedroom and on every level of your house, including the basement. Some states now require that you have a carbon monoxide alarm in each bedroom of the house. If you install only one carbon monoxide alarm in your home, place it near or in your bedroom.

Q: What is the proper way to do a carbon monoxide alarm test?
A: The following procedure is the proper way to do a carbon monoxide alarm test - Press and hold the Test Button on the front of the alarm until the alarm sounds. Be sure you hold the button down long enough; it can take up to 20 seconds for the alarm to respond to the test.

Q: Is it a false alarm when my carbon monoxide alarm sounds and there doesn't seem to be a problem?
A: A carbon monoxide alarm false alarm should not occur if your alarm is in working order. Remember, carbon monoxide is an odorless, colorless gas. If your carbon monoxide alarm went off, it detected potentially harmful amounts of carbon monoxide. After the professionals have evaluated the situation, make sure no one has any symptoms of carbon monoxide poisoning.

Here are a few situations that may cause a carbon monoxide alarm "false alarm:"
  • The carbon monoxide alarm needs to be relocated. Carbon monoxide alarms should be located 15-20 feet away from all fossil fuel burning sources like furnaces and stoves. Alarms should be located 10 feet away from sources of humidity like showers.
  • Fossil fuel burning appliances may not be burning fuel completely. Check pilot lights/flames for blue color. Appearance of yellow or orange flames indicates incomplete combustion-a source of carbon monoxide.

Q: Will carbon monoxide alarms detect explosive gas leaks?
A: No, a single function carbon monoxide alarm reacts to carbon monoxide only. To detect explosive gas, you need an explosive gas detector. Different kinds of explosive gas can be detected and it is recommended that any home that utilizes natural or propane gas have at least one explosive gas leak detector.

Q: I'm ready to change my alarm battery - what replacement batteries can I use?
A: Check your User's Manual or the nameplate on the back of the alarm. Different smoke detectors & CO alarms use different kinds of batteries - 9V, AA, AAA - it all depends on the particular model you have. Use quality batteries like lithium batteries - having plenty of power is worth any extra cost. Never use rechargeable batteries because they may not always provide a consistent charge.

Ordering a large quantity? Click the image below to send a bulk order request to our friendly sales staff who can create a quote and provide personal service for your order! Enter the information requested below and our sales staff will respond in 1-2 business days. (Monday through Friday 8am-5pm CST)

Click here for Bulk Buy request Please include as much detail as possible with your request:
  • Item(s) of interest.
  • Quantity Required.
  • Shipping Address.
  • Purchase Time Frame.
  • Contact Information.
  • See if we are running any Specials or what others are saying
  • Learn More is operated by eAccess Solutions, Inc., under license by First Alert.

© 2017 All Rights Reserved. This website is operated by eAccess Solutions, Inc.