Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
Heads up, this deal has expired. Want to create a deal alert for this item?
expired Posted by TattyBear | Staff • Nov 15, 2022
expired Posted by TattyBear | Staff • Nov 15, 2022

First Alert Carbon Monoxide CO250B Detector w/ 9V Battery

$15

$37

59% off
Amazon
21 Comments 7,294 Views
Visit Amazon
Good Deal
Save
Share
Deal Details
Amazon.com has First Alert Carbon Monoxide CO250 Detector w/ 9V Battery (‎CO250B) on sale for $14.50. Shipping is free with Prime or on orders $25+.

Thanks Deal Hunter TattyBear for sharing this deal

Features:
  • End of life chirping signal
  • 2 silence features that silence both alarm and low-battery chirp
  • Includes 9-Volt Battery and all necessary mounting hardware
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • Electrochemical CO Sensor is the most accurate technology available

Editor's Notes

Written by SaltyOne | Staff
  • About this Offer: This sale price is $4.50 less (23.68% Savings) than the previous sale price of $19 according to price history.
  • Reviews: This product receives 4.7 Stars out of 1,200 Customer Reviews.
  • Amazon Return Policy: For the 2022 holiday season, returnable items purchased between October 11 and December 25, 2022 can be returned until January 31, 2023.
  • About this Store:

Original Post

Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon.com has First Alert Carbon Monoxide CO250 Detector w/ 9V Battery (‎CO250B) on sale for $14.50. Shipping is free with Prime or on orders $25+.

Thanks Deal Hunter TattyBear for sharing this deal

Features:
  • End of life chirping signal
  • 2 silence features that silence both alarm and low-battery chirp
  • Includes 9-Volt Battery and all necessary mounting hardware
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • Electrochemical CO Sensor is the most accurate technology available

Editor's Notes

Written by SaltyOne | Staff
  • About this Offer: This sale price is $4.50 less (23.68% Savings) than the previous sale price of $19 according to price history.
  • Reviews: This product receives 4.7 Stars out of 1,200 Customer Reviews.
  • Amazon Return Policy: For the 2022 holiday season, returnable items purchased between October 11 and December 25, 2022 can be returned until January 31, 2023.
  • About this Store:

Original Post

Community Voting

Deal Score
+14
Good Deal
Visit Amazon

Price Intelligence

Model: Carbon Monoxide Alarm, Electrochemical Sensor, 85 dB @ 10 ft Audible Alert, 9V

Deal History 

Sale Price
Slickdeal
  • $NaN
  • Today

Current Prices

Sort: Lowest to Highest | Last Updated 7/11/2025, 10:09 PM
Sold By Sale Price
Amazon$19.80

Leave a Comment

Unregistered (You)

Top Comments

luckydog97
4461 Posts
2632 Reputation
People should be investing into low level carbon monoxide monitors like the one from Defender. Yes it is notably more expensive, but these detectors are ONLY required to prevent death. Most won't even alarm until around 70ppm of CO after hours of exposure, which means two things...

1) You'd be exposed to high levels of CO for long periods, often resulting in notable symptoms, before it would finally audibly alarm you to the threat.

2) You could be constantly exposed to CO levels at less than alarm threshold levels, but still high enough to cause MANY negative health consequences, especially for the sick, elderly, or those with specific respiratory or cardiovasular conditions.

Carbon monoxide is dangerous. Invest in your safety, ESPECIALLY if you have any reasonable expectation of being exposed to higher levels of CO...basically if you burn anything for some sort of heating (appliances/water heater/furnace/fireplace/et), OR, if you live very close to a high traffic area, as vehicle exhaust can be significant enough to raise local CO levels to symptomatic levels with long term exposure.
CalmCable4879
229 Posts
880 Reputation
in case this helps

What's the difference between BRK and First Alert alarms?
The same parent company (Newell Brands) owns First Alert and BRK. First Alert is our retail division, and BRK is our commercial division.

Note:

Some retailers sell BRK products under the First Alert brand. Although BRK packaging is different, rest assured that you'll receive the same quality First Alert product.

20 Comments

Sign up for a Slickdeals account to remove this ad.

Nov 15, 2022
3,527 Posts
Joined Sep 2006
Nov 15, 2022
buzzy
Nov 15, 2022
3,527 Posts
The one in the OP or the CO400FF for $18?
https://smile.amazon.com/First-Al...000N8OYXI/
Nov 15, 2022
202 Posts
Joined Nov 2019
Nov 15, 2022
GoDm23
Nov 15, 2022
202 Posts
Do these work better when installed closer to the ground?
Nov 15, 2022
199 Posts
Joined Dec 2012
Nov 15, 2022
babykiller
Nov 15, 2022
199 Posts
Brand is not first alert, is BRK.
Nov 15, 2022
229 Posts
Joined Aug 2020
Nov 15, 2022
CalmCable4879
Nov 15, 2022
229 Posts
Quote from babykiller :
Brand is not first alert, is BRK.
in case this helps

What's the difference between BRK and First Alert alarms?
The same parent company (Newell Brands) owns First Alert and BRK. First Alert is our retail division, and BRK is our commercial division.

Note:

Some retailers sell BRK products under the First Alert brand. Although BRK packaging is different, rest assured that you'll receive the same quality First Alert product.
Nov 15, 2022
229 Posts
Joined Aug 2020
Nov 15, 2022
CalmCable4879
Nov 15, 2022
229 Posts
1
Nov 15, 2022
4,461 Posts
Joined Nov 2013
Nov 15, 2022
luckydog97
Nov 15, 2022
4,461 Posts

Our community has rated this post as helpful. If you agree, why not thank luckydog97

People should be investing into low level carbon monoxide monitors like the one from Defender. Yes it is notably more expensive, but these detectors are ONLY required to prevent death. Most won't even alarm until around 70ppm of CO after hours of exposure, which means two things...

1) You'd be exposed to high levels of CO for long periods, often resulting in notable symptoms, before it would finally audibly alarm you to the threat.

2) You could be constantly exposed to CO levels at less than alarm threshold levels, but still high enough to cause MANY negative health consequences, especially for the sick, elderly, or those with specific respiratory or cardiovasular conditions.

Carbon monoxide is dangerous. Invest in your safety, ESPECIALLY if you have any reasonable expectation of being exposed to higher levels of CO...basically if you burn anything for some sort of heating (appliances/water heater/furnace/fireplace/et), OR, if you live very close to a high traffic area, as vehicle exhaust can be significant enough to raise local CO levels to symptomatic levels with long term exposure.
2
Nov 15, 2022
4,453 Posts
Joined Feb 2010
Nov 15, 2022
Splash15
Nov 15, 2022
4,453 Posts
Quote from luckydog97 :
People should be investing into low level carbon monoxide monitors like the one from Defender. Yes it is notably more expensive, but these detectors are ONLY required to prevent death. Most won't even alarm until around 70ppm of CO after hours of exposure, which means two things...

1) You'd be exposed to high levels of CO for long periods, often resulting in notable symptoms, before it would finally audibly alarm you to the threat.

2) You could be constantly exposed to CO levels at less than alarm threshold levels, but still high enough to cause MANY negative health consequences, especially for the sick, elderly, or those with specific respiratory or cardiovasular conditions.

Carbon monoxide is dangerous. Invest in your safety, ESPECIALLY if you have any reasonable expectation of being exposed to higher levels of CO...basically if you burn anything for some sort of heating (appliances/water heater/furnace/fireplace/et), OR, if you live very close to a high traffic area, as vehicle exhaust can be significant enough to raise local CO levels to symptomatic levels with long term exposure.
How close is close to a high traffic area?

Sign up for a Slickdeals account to remove this ad.

Nov 16, 2022
4,461 Posts
Joined Nov 2013
Nov 16, 2022
luckydog97
Nov 16, 2022
4,461 Posts
Quote from Splash15 :
How close is close to a high traffic area?
That is hard to say as there are many variables, but being very near to very busy roads (where many cars and trucks pass by constantly) does increase your exposure to many contaminants, including but not limited to carbon monoxide. There are much more sensitive carbon monoxide monitors for around $135 that have resolutions down to around 1ppm accuracy if you're interested.

If you have young children, a pregnant woman, elderly, or anyone with certain medical conditions in your household, having a professional air quality test conducted would be highly advisable.
Nov 16, 2022
2,215 Posts
Joined Nov 2010

This comment has been rated as unhelpful by Slickdeals users.

Nov 16, 2022
1,163 Posts
Joined Nov 2016
Nov 16, 2022
shigro420
Nov 16, 2022
1,163 Posts
Quote from rage4order :
No. Install like a smoke detector high on the wall.
Actually, they're best at head-level…. since that's where your head will be.

CO doesn't rise or fall, it's pretty neutrally buoyant in our atmosphere.

The Camel says this is historically low (since June) but they're often on sale for $17. So, not click. And they've NEVER been $36.

Can't we get Congress to actually do some thing about Amazon faking their MSRP?

As per the Camel, these often hit $17. Although historically low (since June), this ain't that slick.

Best to have one near your burning appliance and one in your bedroom/living room.
Last edited by shigro420 November 15, 2022 at 09:19 PM.
Nov 16, 2022
1,957 Posts
Joined Jan 2011
Nov 16, 2022
samHD
Nov 16, 2022
1,957 Posts
i remember reading about some of these being networkable, via a common wire between sensors. What is that feature/ability called?
Nov 16, 2022
2,447 Posts
Joined Nov 2013
Nov 16, 2022
truedealsearcher
Nov 16, 2022
2,447 Posts
Quote from luckydog97 :
That is hard to say as there are many variables, but being very near to very busy roads (where many cars and trucks pass by constantly) does increase your exposure to many contaminants, including but not limited to carbon monoxide. There are much more sensitive carbon monoxide monitors for around $135 that have resolutions down to around 1ppm accuracy if you're interested.

If you have young children, a pregnant woman, elderly, or anyone with certain medical conditions in your household, having a professional air quality test conducted would be highly advisable.
Could you please suggest one that you mentioned which is sensitive to 1 ppm and can alarm. Thank you in advance
Nov 16, 2022
69 Posts
Joined Jun 2016
Nov 16, 2022
Saugeye
Nov 16, 2022
69 Posts
Honestly, I would try and find a detector that uses AA's instead of 9V. If you're like me, those things always seem to chirp in the middle of the night, and I never have spare 9V's laying around...
1
Nov 16, 2022
2,215 Posts
Joined Nov 2010
Nov 16, 2022
rage4order
Nov 16, 2022
2,215 Posts
Quote from shigro420 :
Actually, they're best at head-level…. since that's where your head will be.

CO doesn't rise or fall, it's pretty neutrally buoyant in our atmosphere.

The Camel says this is historically low (since June) but they're often on sale for $17. So, not click. And they've NEVER been $36.

Can't we get Congress to actually do some thing about Amazon faking their MSRP?

As per the Camel, these often hit $17. Although historically low (since June), this ain't that slick.

Best to have one near your burning appliance and one in your bedroom/living room.
My point was, not low to the floor. Same height as smoke detectors is just fine. A simple Google search will do the trick.
Last edited by rage4order November 16, 2022 at 07:21 AM.

Sign up for a Slickdeals account to remove this ad.

Nov 16, 2022
4,453 Posts
Joined Feb 2010
Nov 16, 2022
Splash15
Nov 16, 2022
4,453 Posts
Quote from luckydog97 :
That is hard to say as there are many variables, but being very near to very busy roads (where many cars and trucks pass by constantly) does increase your exposure to many contaminants, including but not limited to carbon monoxide. There are much more sensitive carbon monoxide monitors for around $135 that have resolutions down to around 1ppm accuracy if you're interested.

If you have young children, a pregnant woman, elderly, or anyone with certain medical conditions in your household, having a professional air quality test conducted would be highly advisable.
Would people with purpleair sensors around me work? I see a sensor closer to the freeway and its at 17ppm.

Leave a Comment

Unregistered (You)

Popular Deals

View All

Trending Deals

View All