





🐾 Breathe Easy, Live Confidently: Ultra-Sensitive CO Protection for Your Whole Family
The Kidde Ultra-Sensitive Carbon Monoxide Detector offers advanced electrochemical sensing to detect dangerously low CO levels below 30 PPM, ideal for homes with pets or medically vulnerable individuals. Featuring a clear digital display that monitors CO from 10 PPM, a loud 85-decibel alarm, and battery-powered operation with included 3-AA batteries, it ensures continuous protection even during power failures. Easy to install with wall mount or tabletop options, it also includes a 10-year end-of-life warning to guarantee long-term safety and peace of mind.





| ASIN | B00IO64NXC |
| Alarm | Audible |
| Batteries | 3 AA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Life | 8760 Hours |
| Best Sellers Rank | #137,241 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #179 in Carbon Monoxide Detectors |
| Brand | Kidde |
| Color | White |
| Customer Reviews | 4.1 4.1 out of 5 stars (143) |
| Date First Available | February 26, 2014 |
| Global Trade Identification Number | 00047871099429 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 8 ounces |
| Item model number | 21009942 |
| Manufacturer | Kidde |
| Number of Items | 1 |
| Operating Humidity | 10-95 % Relative Humidity (RH), non- condensing |
| Part Number | 09942 |
| Pattern | Detector |
| Power Source | Battery Powered |
| Product Dimensions | 4.5"D x 1.5"W x 2.75"H |
| Sensor Type | Electrochemical |
| Size | UNIT |
| Style | Digital |
| UPC | 047871099429 |
R**E
Far Better than the Cheap Models
Gives a readout of the carbon monoxide levels. Glad to see it's reading zero. Easy to mount. The ultra sensitive model is far better than the bargain brand detectors since it responds quicker ... which is important if there is a fireplace in the house, gas stove, or gas heat.
G**E
Good peace of mind
Bought this because I wanted to test for low ppm CO. Says there is 0 carbon monoxide, makes me feel better knowing I'm not breathing in any carbon monoxide lol Easy to use and set up, and definitely loud enough to wake you up.
L**O
It really detects CO at 10ppm.
I bought these because my heater system is 10yo and am concerned that as it ages, CO leaks may become likely to occur. It has worked well and recorded CO levels as low as 11ppm, though without seeing of the alarm because the level didn't last long enough. I suspect my oven as the source of CO because my heaters runs for weeks without registering anything above the minimum 10ppm. I rated this product 4 stars solely because Kiddie states it includes batteries but they only provide 2 batteries when it requires 3 batteries. Kiddie refused to give me the additional battery.
L**S
Price too high
Product is ok but the price seems to be way too high.
R**.
Batteries
Only two of three AA batteries sent
J**Y
Reads at low levels
I love that this monitor can read low levels of CO. We have a gas stove and when I turn it on the monitor picks up on that and reads around 15. When I turn the stove off it goes back to 0. Gives me great peace of mind. I have another CO monitor that won’t display anything until 70 supposedly. I much prefer this one where I can see any level over 10.
P**E
Much better sensor than most. Easier to install than others.
I was concerned about the possibility of gas that would be below the standard ceiling installed alarms I have. This one is very sensitive and so easy. I just put the batteries in and sat it on top of a bureau.
D**N
Unit 1 year old upon receipt
Haven't set it up yet, but it was manufactured in August 2023 and received in October 2024. Not sure if that is "old" stock but a little disappointing.
Trustpilot
1 month ago
1 month ago