I bought this to bring with me on my travels as I noticed that carbon monoxide alarms are frequently not found in Airbnbs. The small compact shape and easy portability gives me peace of mind when I'm away. I tested the alarm and it detected levels of the gas pretty quickly, so I feel assured that it works. My only gripe is that the battery life is shorter than the advertised 90 hours. It's also nice that it displays temp and humidity and I have found those readings to be accurate as well as compared to other sensors I have in the house.

It was a great product and did what I needed it to do- detect carbon monoxide- which it didn’t… I was pretty sure I didn’t have any carbon monoxide in my home as I don’t have any gas engines or anything that makes carbon monoxide. I just purchased a home with a built in carbon monoxide detector in the alarm system… which would go off periodically for no reason as far as I could detect as again I don’t have any gas engines or garage connected to my home where one would park a car for instance… so for peace of mind and because I have guests staying in my home, I purchased for peace of mind. It was a great instrument- easy to read and I trusted it as I brought it out to my car and calibrated it as it did show carbon monoxide when by the car exhaust- just none in the home. I live close to a metropolis and I was convinced my home detector is picking up smog- and looks like I was right if it picks up anything - could just be a glitchy product on the home alarm system…

This is nice. Although I am not interested in the amount of humidity, I am interested in a Carbon Monoxide and Smoke Detector for our Airstream. We checked it out with the smoke and works and if the carbon monoxide alarm is as loud it will be great. It has a nice clear design and it is pleasing to look at.

This carbon monoxide detector is great because of its portability. It is the size of a hockey puck. I like that it is small and I can take it anywhere. It is rechargeable so no tossing away batteries. The screen is nice, clear and very easy to read. I really like the cute emoji status indicator. The temperature and humidity readings are pretty accurate i compared them to my weather station monitor. I have placed this detector in each of my rooms in my house for a few days to test for carbon monoxide and none was found. It is currently in my kitchen. My wife cooks a lot and this device will go off if she forgets to turn on the hood range fans. The battery life is very good. One charge lasted over a week. One thing I did not like about this detector is the round design. It does look nice, but the kick stand does a bad job of keeping the detector upright. When charging the battery the charging cable tilts the detector either to the left or right.

The CEKKIENA Carbon Monoxide Detector is an easy to install and set up detector that provides peace of mind. Accidents with carbon monoxide are a regular occurrence during winter when heating a home.

This carbon monoxide detector is a life saver. Two days after installing it, we forgot to let the windows open a bit at night to get some fresh air and it started beeping in the middle of the night. I had to quickly open the windows wide for the rooms to go back to normal.
I love how simple it looks, but gives you important information such as the temperature and the humidity. Also, it’s small enough to carry around and solidly built to survive drops. Too bad that the battery only lasts a few days, if you leave the screen on. And that it’s designed to be set on a flat surface and not hanged on a wall. It’s pricey too.

 super useful and practical carbon monoxide detector, it also gives you the humidity in the environment and the current temperature where you install it, very useful to measure carbon monoxide levels in your home, it is easy to understand if you do not have this alarm at home I highly recommend purchasing this

This CO detector is very nice to look at.
Everything you need to know about what it does is nicely displayed on the 3 inch circular screen.
In a large and brightly lit display it shows you the amount of Carbon Monoxide present as well as
the temperature and humidity of the surrounding area.
Very nice if you are an herpetologists or need to keep your pet tarantula in optimum conditions.
But is what it displays accurate?
The humidity displayed exactly matched the amount shown on my smart thermostat.
According to my trusty thermometer, the temperature was out a tiny bit.
I looked for a method to calibrate it, but sadly this unit does not support that function.
Not that precise temperature accuracy matters much - the detection of Carbon Monoxide is what really counts.
My unit displays ZERO ppm of Carbon Monoxide - which is re-assuring to know.
As this unit is so portable and can be recharged with a regular 5V USB phone charger, I will be taking this with us in our small motorhome travels.
The motorhome has a propane heater, stove and fridge, so an O2 monitor is a must.

What I like about this CEKKIENA Carbon Monoxide Detector:
- The look and feel of it
- The portability and ease of use.
- The display can be changed to always on, or off after ten minutes.
- Color coded light that indicates various degrees of CO detected.. ( green = OK, yellow = 100-200 ppm
red+siren alarm = more than 200ppm)
- Celsius or Fahrenheit display
- 90 hours of use on one charge.

Negatives:
Not really negatives, but this unit cannot be wall-mounted as the USB connector is located on the back of the unit.
There's a flip-out stand at the back of the unit so it can be set on a shelf, counter top, or mantle.
During R.V. travels, it would have to sit in a drawer.

I'm really glad I have this .... some added security for my family - and I'm looking forward to using it in the motorhome..